# Physics Notes Class 12 Chapter 14 Semiconductor Electronics, Materials, Devices and Sample Circuits

Save this PDF as:

Size: px
Start display at page:

Download "Physics Notes Class 12 Chapter 14 Semiconductor Electronics, Materials, Devices and Sample Circuits"

## Transcription

1 1 P a g e Physics Notes Class 12 Chapter 14 Semiconductor Electronics, Materials, Devices and Sample Circuits It is the branch of science which deals with the electron flow through a vacuum, gas or semiconductor. Classification of substances on the basis of conduction of electricity. Solid We know that, each substance is composed of atoms. Substances are mainly classified into three categories namely solids, liquids and gases. In each solid atoms are at a definite positions and the average distance between them is constant. Depending upon the internal arrangement of atoms, solids are further divided into two groups. 1. Crystalline Solids The solid in which the atoms are arranged in a regular order are called the crystalline solids. In other words, we can say that in a crystalline solid.there is periodicity and regularity of its component atoms in all the directions. For example sodium chloride (common salt), diamond, Sugar, silver etc are the crystalline solids. Their atoms are arranged in a definite geometrical shape. They have a definite melting point. They are anisotropic, i.e., their physical properties such as thermal Conductivity refractive index etc, are different in different directions. They are the real solids. 2. Amorphous Solids The Solids in which the atoms do not have a definite arrangement are called the amorphous solids. They are also called the glassy solids. For example glass, rubber, plastic, power, etc are the amorphous solids. Tbey do not have a definite arrangement of its atoms, i e., they do not have a characteristic geometrical shape.

2 2 P a g e They do not have a definite melting point. They are isotropic. i.e., their physical properties such as conductivity of heat refractive index etc, are same in all the directions. They are not the real solids. Monocrystal and Polycrystalline Monocrystal is a crystal in which the ordered arrangements of the atoms or molecules extends throughout the piece of solid, irrespective of its size. Polycrystal is a crystalline solid in which each piece of the solid has a number of monocrystals with developed faces joined together. The polycrystal ceramic made from PbO, ZnO and TiO are used in gas lighters and telephone receivers. Liquid Crystals Some organic crystalline solid. when heated acquire fluidity but retain their anisotropic properties. They axe called liquid crystals. Some liquid crystals like cyanobiphenyl can change the plane of polarization of light and such Liquid Crystal Displays (LCD) are used in watches and micro calculators. Crystal Lattice A crystal is made up of a three- dimensional array of points such that each point is surrounded by the height bouring POints in an identical way. Such an array of points is known as bravais lattice or space lattice. Unit cell is the smallest unit of the crystal lattice, repetition of which in three dimensions gives rise to crystal lattice. The length of three sides of a unit cell are called Primitives or lattice constant represented by a, b, c. The angle between three crystallographic axis are called interfacial angles represented by α, β and γ. The primitives and interfacial angles constitute the lattice parameters of a unit cell. [The cubic crystal may be of the form, simple cubic (sc) lattice, the body centred cubic (bee) lattice, the face centred Cubic (fcc) lattice.] The coordination number is defined as the number of nearest neighbours around any lattice point (or atom) in the crystal lattice. (a) For sc, coordination number is 6.

3 3 P a g e (b) For bee, coordination number is 8. (c) For fcc, coordination number is 12. (d) For sc, atomic radius is a / 2. (e) For bcc, atomic is a 3 / 4. (f) For fcc. atomic radius is a / 2 2. Classification of solids on the basis of conductivity (i) Conductor Conductors are those substances through which electricity can pass easily, e.g., all metals are conductors. (ii) Insulator Insulators are those substances through which electricity cannot pass, e.g., wood. rubber, mica etc. (iii) Semiconductor Semiconductors are those substances whose conductivity lies between conductors and insulators. e.g., germanium, silicon, carbon etc. Energy Bands of Solids 1. Energy Band In a crystal due to interatomic interaction valence electrons of one atom are shared by more than one atom in the crystal. Now splitting of energy levels takes place. The collection of these closely spaced energy levels is called an energy band. 2. Valence Band This energy band contains valence electrons. This band may be PartIally or completely filled with electrons but never be empty. The electrons in this band are not capable of gaining energy from external electric field to take part in conduction of current. 3. Conduction Band This band contains conduction electrons. This band is either empty or Partially filled with electrons. Electrons present in this band take part in the conduction of current. 4. Forbidden Band This band is completely empty. The minimum energy required to shift an electron from valence band to conduction band is called band gap (E g ).

4 4 P a g e Thermionic Emission Thermionic emission occurs when a metal is heated to a high temperature, the free electrons in the metal gain kinetic energy sufficient to escape through the surface of the metal. Thermionic Diode The thermionic diode is a two electrode (cathode and plate) device based on thermionic emission. A diode allows unidirectional flow of electrons, i.e., only when the plate is positive with respect to cathode. Hence, it is also called a valve. The triode value consists of three electrodes, e.g., cathode. plate and grid enclosed in an evacuated glass bulb. Grid influences the space charge and controls the flow of plate current. [When the grid is given a negative potential with respect to cathode. It repels the electrons escaping from the cathode and Increases the effect of space charge, at sufficiently negative grid potential is known as cut-off grid bias. If the grid is given a positive potential with respect to cathode, it attracts the electrons and decreases the effect of space charge. The increasing the plate current. In this case a current flow into the circuit, thus grid modifies the function of valve.] Grid is always kept at small negative potential with respect to cathode. Triode can be used as an amplifier, oscillator modulator and demodulator. An oscillator is an electronic device which generates AC voltage froid DC power. It is basically a positive feedback amplifier with infinite voltage gain. Types of Semiconductor (i) Intrinsic Semiconductor A semiconductor in its pure state is called intrinsic semiconductor. (ii) Extrinsic Semiconductor A semiconductor doped with suitable impurity to increase its impurity, is called extrinsic semiconductor. On the basis of doped impurity extrinsic semiconductors are of two types (i) n-type Semiconductor Extrinsic semiconductor doped with pentavalent impurity like As, Sb, Bi, etc in which negatively charged electrons works as charge carrier, is called n-type semiconductor.

5 5 P a g e Every pentavalent impurity atom donate one electron in the crystal, therefore it is called a doner atom (ii) p -type Semiconductor Extrinsic semiconductor doped with trivalent impurity like Al, B, etc, in which positively charged holes works as charge carriers, is called p-type semiconductor. Every trivalent impurity atom have a tendency to accept one electron, therefore it is called an acceptor atom. In a doped semiconductor n e n h = n 2 i where n e and n h are the number density of electrons and holes and n i is number density of intrinsic carriers, i.e., electrons or holes. In n-type semiconductor, n e > > n h In p -type semiconductor, n h > > n e Electrical conductivity of extrinsic semiconductor is given by σ = 1 / ρ = e (n e μ e + n h μ h ) where ρ is resistivity, μ e and μ h are mobility of electrons and holes respectively. Note Energy gap for Ge is 0.72 ev and for Si it is 1.1 ev. p-n Junction An arrangement consisting a p -type semiconductor brought into a close contact with n-type semiconductor, is called a p -n junction. The current in a p-n junction is given by k B = I o (e ev/k BT 1 ) where I o is reverse saturation current, V is potential difference across the diode, and k B is the Boltzmann constant.

6 6 P a g e Terms Related to p-n Junction (i) Depletion Layer At p-n. junction a region is created, where there is no charge carriers. This region is called depletion layer. The width of this region is of the order of 10 6 m. (ii) Potential Barrier The potential difference across the depletion layer is called potential barrier. Barrier potential for Ge is 0.3 V and for Si is 0.7 V. (iii) Forward Biasing In this biasing, the p -side is connected to positive terminal and n-side to negative terminal of a battery. In this biasing, forward current flows due to majority charge carriers. The width of depletion layer decreases. (iv) Reverse Biasing In this biasing, the p-side is connected to negative terminal and n-side to positive terminal of a battery. In this biasing, reverse current flows due to minority charge carriers. The width of depletion layer increases. A p-n junction diode can be utilized as a rectifier. Zener diode, photo-diode, light-emitting diode, etc are specially designed p-n. junction diodes. p-n Junction Diode The current through p-n junction flow only from p toward n and not from n toward p. The maximum voltage that a junction diode can bear without break is called zener voltage and the junction diodes possessing this voltage is known as zener diode.

7 7 P a g e Resistance of diode R = V / I Rectifier A device which convert alternating current or voltage into direct current or voltage IS known as rectifier. The process of converting AC into DC IS caned rectification. Half-Wave Rectifier A half-wave rectifier converts the half cycle of applied AC signal into DC signal. Ordinary transformer may be used here. Full-Wave Rectifier A full-wave rectifier converts the whole cycle of applied AC signal into DC signal. Centre top,transformer is used here. [Half-wave rectifier converts only one-half of AC Into DC while full wave rectifier rectifies both halves of AC input.]

8 8 P a g e Transistor A transistor is an arrangement obtained by growing a thin layer of one type of semiconductor between two thick layers of other similar type semiconductor. Types of Transistors The left side semiconductor is called emitter, the right side semiconductor is called collector and the thin middle layer is called base. Emitter is highly doped and base is feebly doped. A transistor can be utilized as an amplifier and oscillator but not a rectifier Maximum amplification is obtained in common-emitter configuration.

9 9 P a g e Transistor as an Amplifier An amplifier is a device which is used for increasing the amplitude of variation of alternating voltage 01 current or power. The amplifier thus produces an enlarged version of the input signal. The general concept of amplification is represented in figure. There are two input terminals for the signal to be amplified and two output terminals for connecting the load; and a means of supplying power to the amplifier. 1. In Common Base Amplifier, AC current gain (α AC ) = ΔI c / ΔI e where ΔI c is change in collector current and ΔI e change in emitter current. AC voltage gain (A V ) = Output voltage / Input voltage = α AC * Resistance gain = α AC * R o / R i where R o is output resistance of the circuit and R i is input resistance of the circuit. AC power gain = Change in output power / Change in input power = AC voltage gain * AC current gain = α 2 AC * resistance gain

10 10 P a g e The input and output signals are in the same phase. There is no amplification in current of a given signal. There is an amplification in voltage and power of the given signal. 2. In Common Emitter Amplifier AC current gain (&beta AC ) = ΔI c / ΔI e where ΔI c is change in collector current and ΔI e change in base current. AC voltage gain (A V ) = &beta AC * resistance gain AC power gain =&beta 2 AC * Resistance gain Relation between the current gain of common base and common emitter amplifier. β = α / 1 α = I c / I e The input and output signals are out of phase by π or 180 There is amplification in current, voltage and power of the given signal.

11 11 P a g e Light Emitting Diodes (LED) It is forward biased p-ri junction diode which emits light when recombination of electrons and holes takes place at the junction. If the semiconducting material of p-ri junction is transparent to light, the light is emitting and the junction becomes a light source, i.e., Light Emitting Diode (LED). The colour of the light depends upon the types of material used in making the semiconductor diode. (i) Gallium Arsenide (Ga-As) Infrared radiation (ii) Gallium phosphide (GaP) Red or green light (iii) Gallium Arsenide phosphide (GaAsP) Red or yellow light Logic Gate A digital circuit which allows a signal to pass through it, only when few logical relations are satisfied, is called a logic gate. Truth Table A table which shows all possible input and output combinations is called a truth table. Basic Logic Gates (i) OR Gate It is a two input and one output logic gate. (ii) AND Gate It is a two input and one output logic gate

12 12 P a g e (iii) NOT Gate It is a one input and one output logic gate. Combination of Gates (i) NAND Gate When output of AND gate is applied as input to a NOT gate, then it is called a NAND gate. Boolean expression Y = A * B (Y equals negated of A AND B) (ii) NOR Gate When output of OR gate is applied as input to a NOT gate, then it is called a NOR gate.

13 13 P a g e Boolean expression Y = A + B ( Y equals negated of A OR B) The Boolean expression obey commutative law associative law as well as distributive law. 1. A + B = B+ A 2. A B = B A 3. A + (B + C) = (A + B) + C Demorgan s theorems 1. A + B = A * B 2. A * B = A + B

### Semiconductors, diodes, transistors

Semiconductors, diodes, transistors (Horst Wahl, QuarkNet presentation, June 2001) Electrical conductivity! Energy bands in solids! Band structure and conductivity Semiconductors! Intrinsic semiconductors!

### Chapter No: 14 Chapter: Semiconductor Electronics: Materials, Devices And Simple Circuits (ONE MARK QUESTIONS)

Chapter No: 14 Chapter: Semiconductor Electronics: Materials, Devices And Simple Circuits (ONE MARK QUESTIONS) 1. What is an electronic device? It is a device in which controlled flow of electrons takes

### Crystalline solids. A solid crystal consists of different atoms arranged in a periodic structure.

Crystalline solids A solid crystal consists of different atoms arranged in a periodic structure. Crystals can be formed via various bonding mechanisms: Ionic bonding Covalent bonding Metallic bonding Van

### The Diode. Diode Operation

The Diode The diode is a two terminal semiconductor device that allows current to flow in only one direction. It is constructed of a P and an N junction connected together. Diode Operation No current flows

### Yrd. Doç. Dr. Aytaç Gören

H2 - AC to DC Yrd. Doç. Dr. Aytaç Gören ELK 2018 - Contents W01 Basic Concepts in Electronics W02 AC to DC Conversion W03 Analysis of DC Circuits W04 Transistors and Applications (H-Bridge) W05 Op Amps

### Solid-State Physics: The Theory of Semiconductors (Ch. 10.6-10.8) SteveSekula, 30 March 2010 (created 29 March 2010)

Modern Physics (PHY 3305) Lecture Notes Modern Physics (PHY 3305) Lecture Notes Solid-State Physics: The Theory of Semiconductors (Ch. 10.6-10.8) SteveSekula, 30 March 2010 (created 29 March 2010) Review

### 3. Diodes and Diode Circuits. 3. Diodes and Diode Circuits TLT-8016 Basic Analog Circuits 2005/2006 1

3. Diodes and Diode Circuits 3. Diodes and Diode Circuits TLT-8016 Basic Analog Circuits 2005/2006 1 3.1 Diode Characteristics Small-Signal Diodes Diode: a semiconductor device, which conduct the current

### Analog Electronics. Module 1: Semiconductor Diodes

Analog Electronics s PREPARED BY Academic Services Unit August 2011 Applied Technology High Schools, 2011 s Module Objectives Upon successful completion of this module, students should be able to: 1. Identify

### Diodes and Transistors

Diodes What do we use diodes for? Diodes and Transistors protect circuits by limiting the voltage (clipping and clamping) turn AC into DC (voltage rectifier) voltage multipliers (e.g. double input voltage)

### Lecture 8: Extrinsic semiconductors - mobility

Lecture 8: Extrinsic semiconductors - mobility Contents Carrier mobility. Lattice scattering......................... 2.2 Impurity scattering........................ 3.3 Conductivity in extrinsic semiconductors............

### Doped Semiconductors. Dr. Katarzyna Skorupska

Doped Semiconductors Dr. Katarzyna Skorupska 1 Doped semiconductors Increasing the conductivity of semiconductors by incorporation of foreign atoms requires increase of the concentration of mobile charge

### The Physics of Energy sources Renewable sources of energy. Solar Energy

The Physics of Energy sources Renewable sources of energy Solar Energy B. Maffei Bruno.maffei@manchester.ac.uk Renewable sources 1 Solar power! There are basically two ways of using directly the radiative

### Theory of Transistors and Other Semiconductor Devices

Theory of Transistors and Other Semiconductor Devices 1. SEMICONDUCTORS 1.1. Metals and insulators 1.1.1. Conduction in metals Metals are filled with electrons. Many of these, typically one or two per

### Semiconductor I. Semiconductors. germanium. silicon

Basic Electronics Semiconductor I Materials that permit flow of electrons are called conductors (e.g., gold, silver, copper, etc.). Materials that block flow of electrons are called insulators (e.g., rubber,

### Special-Purpose Diodes

7 Special-Purpose Diodes 7.1 Zener Diode 7.2 Light-Emitting Diode (LED) 7.3 LED Voltage and Current 7.4 Advantages of LED 7.5 Multicolour LEDs 7.6 Applications of LEDs 7.7 Photo-diode 7.8 Photo-diode operation

### Solid State Detectors = Semi-Conductor based Detectors

Solid State Detectors = Semi-Conductor based Detectors Materials and their properties Energy bands and electronic structure Charge transport and conductivity Boundaries: the p-n junction Charge collection

### Electronics Field-effect transistors

Electronics Field-effect transistors Prof. Márta Rencz, Gergely Nagy BME DED October 7, 2013 The basics of field-effect transistors The operation of field-effect transistors is based on ability of controlling

### HIGHER PHYSICS. Electricity. GWC Revised Higher Physics 12/13.

HIGHER PHYSICS Electricity http://blog.enn.com/?p=481 1 GWC Revised Higher Physics 12/13 HIGHER PHYSICS a) MONITORING and MEASURING A.C. Can you talk about: a.c. as a current which changes direction and

### INSTITUTE FOR APPLIED PHYSICS Physical Practice for Learners of Engineering sciences Hamburg University, Jungiusstraße 11

INSTITUTE FOR APPIED PHYSICS Physical Practice for earners of Engineering sciences Hamburg University, Jungiusstraße 11 Hall effect 1 Goal Characteristic data of a test semiconductor (Germanium) should

### BASIC ELECTRONICS TRANSISTOR THEORY. December 2011

AM 5-204 BASIC ELECTRONICS TRANSISTOR THEORY December 2011 DISTRIBUTION RESTRICTION: Approved for Public Release. Distribution is unlimited. DEPARTMENT OF THE ARMY MILITARY AUXILIARY RADIO SYSTEM FORT

### Semiconductor Detectors Calorimetry and Tracking with High Precision

Semiconductor Detectors Calorimetry and Tracking with High Precision Applications 1. Photon spectroscopy with high energy resolution. Vertex detection with high spatial resolution 3. Energy measurement

### Basic Electronics Learning by doing Prof. T.S. Natarajan Department of Physics Indian Institute of Technology, Madras

Basic Electronics Learning by doing Prof. T.S. Natarajan Department of Physics Indian Institute of Technology, Madras Lecture 40 (Field Effect Transistor (FET) (Types, JFET, MOSFET, Complementary MOSFET)

### Electrical Properties

Electrical Properties Outline of this Topic 1. Basic laws and electrical properties of metals 2. Band theory of solids: metals, semiconductors and insulators 3. Electrical properties of semiconductors

### Diodes. 1 Introduction 1 1.1 Diode equation... 2 1.1.1 Reverse Bias... 2 1.1.2 Forward Bias... 2 1.2 General Diode Specifications...

Diodes Contents 1 Introduction 1 1.1 Diode equation................................... 2 1.1.1 Reverse Bias................................ 2 1.1.2 Forward Bias................................ 2 1.2 General

### Solar Photovoltaic (PV) Cells

Solar Photovoltaic (PV) Cells A supplement topic to: Mi ti l S Micro-optical Sensors - A MEMS for electric power generation Science of Silicon PV Cells Scientific base for solar PV electric power generation

### Understanding the p-n Junction by Dr. Alistair Sproul Senior Lecturer in Photovoltaics The Key Centre for Photovoltaic Engineering, UNSW

Understanding the p-n Junction by Dr. Alistair Sproul Senior Lecturer in Photovoltaics The Key Centre for Photovoltaic Engineering, UNSW The p-n junction is the fundamental building block of the electronic

### CHAPTER 1: Semiconductor Materials & Physics

Chapter 1 1 CHAPTER 1: Semiconductor Materials & Physics In this chapter, the basic properties of semiconductors and microelectronic devices are discussed. 1.1 Semiconductor Materials Solid-state materials

### Unit 12 Practice Test

Name: Class: Date: ID: A Unit 12 Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1) A solid has a very high melting point, great hardness, and

### Amorphous Diamond Electron Emitter

Advanced Diamond Energy An Advanced Diamond Solutions, Inc. Initiative Introductory Technology Overview 12 Inman Street, Suite 15 Cambridge, MA 02139 617-576-9164 James Chien-Min Sung Barnas Monteith Michael

### Keonics Certified Embedded System

Duration: 2 Months Basic Electronics Keonics Certified Embedded System 1. Semi Conductors Diodes and Applications 1.1 P-N Junction Diode 1.2 Characteristics and Parameters 1.3 The Diode Current Equation

### Diode Circuits. Operating in the Reverse Breakdown region. (Zener Diode)

Diode Circuits Operating in the Reverse Breakdown region. (Zener Diode) In may applications, operation in the reverse breakdown region is highly desirable. The reverse breakdown voltage is relatively insensitive

### Processing of Semiconducting Materials Prof. Pallab Banner Department of Material Science Indian Institute of Technology, Kharagpur

Processing of Semiconducting Materials Prof. Pallab Banner Department of Material Science Indian Institute of Technology, Kharagpur Lecture - 40 Materials for Photovoltaics This is the last topic in this

### phys4.17 Page 1 - under normal conditions (pressure, temperature) graphite is the stable phase of crystalline carbon

Covalent Crystals - covalent bonding by shared electrons in common orbitals (as in molecules) - covalent bonds lead to the strongest bound crystals, e.g. diamond in the tetrahedral structure determined

### Amplifier Teaching Aid

Amplifier Teaching Aid Table of Contents Amplifier Teaching Aid...1 Preface...1 Introduction...1 Lesson 1 Semiconductor Review...2 Lesson Plan...2 Worksheet No. 1...7 Experiment No. 1...7 Lesson 2 Bipolar

### Semiconductor Fundamentals

Student Workbook 91564-00 Edition 4 Ê>{XHèRÆ3UË 3091564000503 FOURTH EDITION Second Printing, March 2005 Copyright March, 2003 Lab-Volt Systems, Inc. All rights reserved. No part of this publication may

### FEATURE ARTICLE. Figure 1: Current vs. Forward Voltage Curves for Silicon Schottky Diodes with High, Medium, Low and ZBD Barrier Heights

PAGE 1 FEBRUARY 2009 Schottky Diodes by Rick Cory, Skyworks Solutions, Inc. Introduction Schottky diodes have been used for several decades as the key elements in frequency mixer and RF power detector

### David L. Senasack June, 2006 Dale Jackson Career Center, Lewisville Texas. The PN Junction

David L. Senasack June, 2006 Dale Jackson Career Center, Lewisville Texas The PN Junction Objectives: Upon the completion of this unit, the student will be able to; name the two categories of integrated

### Solar Cell Parameters and Equivalent Circuit

9 Solar Cell Parameters and Equivalent Circuit 9.1 External solar cell parameters The main parameters that are used to characterise the performance of solar cells are the peak power P max, the short-circuit

### Characteristic curves of a solar cell

Related Topics Semi-conductor, p-n junction, energy-band diagram, Fermi characteristic energy level, diffusion potential, internal resistance, efficiency, photo-conductive effect, acceptors, donors, valence

### CHAPTER - 45 SEMICONDUCTOR AND SEMICONDUCTOR DEVICES

1. f = 101 kg/m, V = 1 m CHAPTER - 45 SEMCONDUCTOR AND SEMCONDUCTOR DEVCES m = fv = 101 1 = 101 kg No.of atoms = 101 10 6 10 = 64.6 10 6. a) Total no.of states = N = 64.6 10 6 = 58.5 = 5. 10 8 10 6 b)

### Chapter 1. Semiconductors

THE ELECTRON IN ELECTRIC FIELDS Semiconductors If we were to take two parallel plates and connect a voltage source across them as shown in Figure 1, an electric field would be set up between the plates.

### Intrinsic and Extrinsic Semiconductors, Fermi-Dirac Distribution Function, the Fermi level and carrier concentrations

ENEE 33, Spr. 09 Supplement I Intrinsic and Extrinsic Semiconductors, Fermi-Dirac Distribution Function, the Fermi level and carrier concentrations Zeynep Dilli, Oct. 2008, rev. Mar 2009 This is a supplement

### Lab 1 Diode Characteristics

Lab 1 Diode Characteristics Purpose The purpose of this lab is to study the characteristics of the diode. Some of the characteristics that will be investigated are the I-V curve and the rectification properties.

### AMPLIFIERS BJT BJT TRANSISTOR. Types of BJT BJT. devices that increase the voltage, current, or power level

AMPLFERS Prepared by Engr. JP Timola Reference: Electronic Devices by Floyd devices that increase the voltage, current, or power level have at least three terminals with one controlling the flow between

### Nanoparticle Enhanced Thin Film Solar Cells

Nanoparticle Enhanced Thin Film Solar Cells Solar Cells Solar cells convert visible light to electricity. It is one of the clean sources of energy. In theory a 100 square mile area covered with solar panels

### Introduction to materials science and engineering. structures and properties of materials. Materials Engineering

.Materials Science o The discipline of investigating the relationships that exist between the structures and properties of materials. Materials Engineering o The discipline of designing or engineering

### Lecture 2 Semiconductor Physics (I)

Lecture 2 Semiconductor Physics (I) Outline Intrinsic bond model : electrons and holes Generation and recombination Intrinsic semiconductor Doping: Extrinsic semiconductor Charge Neutrality Reading Assignment:

### Figure 1. Diode circuit model

Semiconductor Devices Non-linear Devices Diodes Introduction. The diode is two terminal non linear device whose I-V characteristic besides exhibiting non-linear behavior is also polarity dependent. The

### Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler. Special Diode Types.

Whites, EE 320 Lecture 9 Page 1 of 8 Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler. Special Diode Types. We ll finish up our discussion of diodes in this lecture by consider a few more

### Bipolar and Field Effect Transistors

Bipolar and Field Effect Transistors Learning Outcomes This chapter deals with the construction and operating characteristics of transistors, depending upon how they are connected into a circuit. The basics

### VIII.4. Field Effect Transistors

Field Effect Transistors (FETs) utilize a conductive channel whose resistance is controlled by an applied potential. 1. Junction Field Effect Transistor (JFET) In JFETs a conducting channel is formed of

### EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME - D.C. CIRCUITS Be able to use circuit theory to determine voltage, current and resistance in direct

### KINETIC MOLECULAR THEORY OF MATTER

KINETIC MOLECULAR THEORY OF MATTER The kinetic-molecular theory is based on the idea that particles of matter are always in motion. The theory can be used to explain the properties of solids, liquids,

### Electrical and Electronic Laboratory Faculty of Engineering Chulalongkorn University. Optoelectronic Devices (OD)

2141274 Electrical and Electronic Laboratory Faculty of Engineering Chulalongkorn University Optoelectronic Devices (OD) Contents A. Objectives B. Introduction 1. Photoconductive effect 2. Radiative recombination

### Chapter 5. Second Edition ( 2001 McGraw-Hill) 5.6 Doped GaAs. Solution

Chapter 5 5.6 Doped GaAs Consider the GaAs crystal at 300 K. a. Calculate the intrinsic conductivity and resistivity. Second Edition ( 2001 McGraw-Hill) b. In a sample containing only 10 15 cm -3 ionized

### Semiconductor p-n junction diodes

Semiconductor p-n junction diodes p n p-n junction formation p-type material Semiconductor material doped with acceptors. Material has high hole concentration Concentration of free electrons in p-type

### Untitled Document. 1. Which of the following best describes an atom? 4. Which statement best describes the density of an atom s nucleus?

Name: Date: 1. Which of the following best describes an atom? A. protons and electrons grouped together in a random pattern B. protons and electrons grouped together in an alternating pattern C. a core

### Laboratory Exercise 3. Static parameters of Field-Effect Transistors (JFET and MOSFET)

Laboratory Exercise 3 Static parameters of Field-Effect Transistors (JFET and MOSFET) The aim of the exercise The main aims of this laboratory exercise are to become acquainted with DC characteristics

### Photovoltaics photo volt Photovoltaic Cells Crystalline Silicon Cells Photovoltaic Systems

1 Photovoltaics Photovoltaic (PV) materials and devices convert sunlight into electrical energy, and PV cells are commonly known as solar cells. Photovoltaics can literally be translated as light-electricity.

### Metal oxide semiconductor field effect transistor (MOSFET) or MOS is widely used for implementing digital designs

The MOSFET Introduction Metal oxide semiconductor field effect transistor (MOSFET) or MOS is widely used for implementing digital designs Assets: High integration density and relatively simple manufacturing

### Wafer Manufacturing. Reading Assignments: Plummer, Chap 3.1~3.4

Wafer Manufacturing Reading Assignments: Plummer, Chap 3.1~3.4 1 Periodic Table Roman letters give valence of the Elements 2 Why Silicon? First transistor, Shockley, Bardeen, Brattain1947 Made by Germanium

### Electronics Prof. D.C. Dube Department of Physics Indian Institute of Technology, Delhi

Electronics Prof. D.C. Dube Department of Physics Indian Institute of Technology, Delhi Module No. #06 Power Amplifiers Lecture No. #01 Power Amplifiers (Refer Slide Time: 00:44) We now move to the next

### Electronic Structure and the Periodic Table Learning Outcomes

Electronic Structure and the Periodic Table Learning Outcomes (a) Electronic structure (i) Electromagnetic spectrum and associated calculations Electromagnetic radiation may be described in terms of waves.

### Regulated D.C. Power Supply

442 17 Principles of Electronics Regulated D.C. Power Supply 17.1 Ordinary D.C. Power Supply 17.2 Important Terms 17.3 Regulated Power Supply 17.4 Types of Voltage Regulators 17.5 Zener Diode Voltage Regulator

### Basic Electronics Prof. Dr. Chitralekha Mahanta Department of Electronics and Communication Engineering Indian Institute of Technology, Guwahati

Basic Electronics Prof. Dr. Chitralekha Mahanta Department of Electronics and Communication Engineering Indian Institute of Technology, Guwahati Module: 2 Bipolar Junction Transistors Lecture-2 Transistor

### CMOS Digital Circuits

CMOS Digital Circuits Types of Digital Circuits Combinational The value of the outputs at any time t depends only on the combination of the values applied at the inputs at time t (the system has no memory)

### Lecture 2 - Semiconductor Physics (I) September 13, 2005

6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 2-1 Lecture 2 - Semiconductor Physics (I) September 13, 2005 Contents: 1. Silicon bond model: electrons and holes 2. Generation and recombination

### Chapter 10 - Liquids and Solids

Chapter 10 - Liquids and Solids 10.1 Intermolecular Forces A. Dipole-Dipole Forces 1. Attraction between molecules with dipole moments a. Maximizes (+) ----- ( - ) interactions b. Minimizes (+) ----- (

### 05 Bipolar Junction Transistors (BJTs) basics

The first bipolar transistor was realized in 1947 by Brattain, Bardeen and Shockley. The three of them received the Nobel prize in 1956 for their invention. The bipolar transistor is composed of two PN

### 9.2 Network Covalent, Ionic, and Metallic Solids

9.2 Network Covalent, Ionic, and Metallic Solids YOU ARE EXPECTED TO BE ABLE TO: Classify non-molecular solids as either network covalent solids, ionic solids, or metallic solids. Relate the physical properties

### Gamma and X-Ray Detection

Gamma and X-Ray Detection DETECTOR OVERVIEW The kinds of detectors commonly used can be categorized as: a. Gas-filled Detectors b. Scintillation Detectors c. Semiconductor Detectors The choice of a particular

### Hello and Welcome to this presentation on LED Basics. In this presentation we will look at a few topics in semiconductor lighting such as light

Hello and Welcome to this presentation on LED Basics. In this presentation we will look at a few topics in semiconductor lighting such as light generation from a semiconductor material, LED chip technology,

### Objectives 200 CHAPTER 4 RESISTANCE

Objectives Explain the differences among conductors, insulators, and semiconductors. Define electrical resistance. Solve problems using resistance, voltage, and current. Describe a material that obeys

### V-I CHARACTERISTICS OF DIODE

V-I CHARACTERISTICS OF DIODE RAVITEJ UPPU 1 1. Aim We try to see the Voltage-Current realtion in Diodes and compare the difference between various types of diodes including Zener Diode. 2. Theory The diode

### Bipolar Transistor Basics

Bipolar Transistor Basics In the Diode tutorials we saw that simple diodes are made up from two pieces of semiconductor material, either silicon or germanium to form a simple PN-junction and we also learnt

### ELECTRICAL CONDUCTION

Chapter 12: Electrical Properties Learning Objectives... How are electrical conductance and resistance characterized? What are the physical phenomena that distinguish conductors, semiconductors, and insulators?

### Half-Wave Rectifiers

Half-Wave Rectifiers Important Points of This Lecture Calculation of output voltage using appropriate piecewise models for diode for simple (unfiltered) half-wave rectifier Differences between calculations

### COURSE: PHYSICS DEGREE: COMPUTER ENGINEERING year: 1st SEMESTER: 1st

COURSE: PHYSICS DEGREE: COMPUTER ENGINEERING year: 1st SEMESTER: 1st WEEKLY PROGRAMMING WEE K SESSI ON DESCRIPTION GROUPS GROUPS Special room for LECTU PRAC session RES TICAL (computer classroom, audiovisual

### CONTENTS. Preface. 1.1.2. Energy bands of a crystal (intuitive approach)

CONTENTS Preface. Energy Band Theory.. Electron in a crystal... Two examples of electron behavior... Free electron...2. The particle-in-a-box approach..2. Energy bands of a crystal (intuitive approach)..3.

### Lecture 2: Semiconductors: Introduction

Lecture 2: Semiconductors: Introduction Contents 1 Introduction 1 2 Band formation in semiconductors 2 3 Classification of semiconductors 5 4 Electron effective mass 10 1 Introduction Metals have electrical

### ANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

ANADOLU UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING EEM 102 INTRODUCTION TO ELECTRICAL ENGINEERING EXPERIMENT 9: DIODES AND DC POWER SUPPLY OBJECTIVE: To observe how a diode functions

### MOS (metal-oxidesemiconductor) 李 2003/12/19

MOS (metal-oxidesemiconductor) 李 2003/12/19 Outline Structure Ideal MOS The surface depletion region Ideal MOS curves The SiO 2 -Si MOS diode (real case) Structure A basic MOS consisting of three layers.

### 7. The current voltage characteristic of electric conductors

KL 7. The current voltage characteristic of electric conductors 7.1 ntroduction The purpose of the present laboratory is to measure the current voltage characteristic of different conducting components.

### Class Notes of. BET102 Basic Electronics Engineering. Diploma in Engineering. Under SCTE&VT, Odisha. Rajendra Kumar Prusty. Sarat Kumar Muduli

Class Notes of BET102 Basic Electronics Engineering Common to 1 st /2 nd Semester of Diploma in Engineering. Under SCTE&VT, Odisha. Prepared By: Rajendra Kumar Prusty Asima Rout Sarat Kumar Muduli BET-102

### High Open Circuit Voltage of MQW Amorphous Silicon Photovoltaic Structures

High Open Circuit Voltage of MQW Amorphous Silicon Photovoltaic Structures ARGYRIOS C. VARONIDES Physics and EE Department University of Scranton 800 Linden Street, Scranton PA, 18510 United States Abstract:

### Types of Epitaxy. Homoepitaxy. Heteroepitaxy

Epitaxy Epitaxial Growth Epitaxy means the growth of a single crystal film on top of a crystalline substrate. For most thin film applications (hard and soft coatings, optical coatings, protective coatings)

### Lecture 22: Integrated circuit fabrication

Lecture 22: Integrated circuit fabrication Contents 1 Introduction 1 2 Layering 4 3 Patterning 7 4 Doping 8 4.1 Thermal diffusion......................... 10 4.2 Ion implantation.........................

### An organic semiconductor is an organic compound that possesses similar

MSE 542 Final Term Paper Title: Organic Semiconductor for Flexible Electronics Name: Chunhung Huang Introduction: An organic semiconductor is an organic compound that possesses similar properties to inorganic

### UNIT I: INTRFERENCE & DIFFRACTION Div. B Div. D Div. F INTRFERENCE

107002: EngineeringPhysics Teaching Scheme: Lectures: 4 Hrs/week Practicals-2 Hrs./week T.W.-25 marks Examination Scheme: Paper-50 marks (2 hrs) Online -50marks Prerequisite: Basics till 12 th Standard

### Measuring Silicon and Germanium Band Gaps using Diode Thermometers

Measuring Silicon and Germanium Band Gaps using Diode Thermometers Haris Amin Department of Physics, Wabash College, Crawfordsville, IN 47933 (Dated: April 11, 2007) This paper reports the band gaps of

### W04 Transistors and Applications. Yrd. Doç. Dr. Aytaç Gören

W04 Transistors and Applications W04 Transistors and Applications ELK 2018 - Contents W01 Basic Concepts in Electronics W02 AC to DC Conversion W03 Analysis of DC Circuits (self and condenser) W04 Transistors

### Introduction OLEDs OTFTs OPVC Summary. Organic Electronics. Felix Buth. Walter Schottky Institut, TU München. Joint Advanced Student School 2008

Felix Buth Joint Advanced Student School 2008 Outline 1 Introduction Difference organic/inorganic semiconductors From molecular orbitals to the molecular crystal 2 Organic Light Emitting Diodes Basic Principals

### PHYSICAL PROPERTIES: GLASS. Forensic Science CC 30.07 Spring 2007 Prof. Nehru

PHYSICAL PROPERTIES: GLASS Physical vs. Chemical Properties The forensic scientist must constantly determine those properties that impart distinguishing characteristics to matter, giving it a unique identity.

### Introduction to VLSI Fabrication Technologies. Emanuele Baravelli

Introduction to VLSI Fabrication Technologies Emanuele Baravelli 27/09/2005 Organization Materials Used in VLSI Fabrication VLSI Fabrication Technologies Overview of Fabrication Methods Device simulation

### ENEE 313, Spr 09 Midterm II Solution

ENEE 313, Spr 09 Midterm II Solution PART I DRIFT AND DIFFUSION, 30 pts 1. We have a silicon sample with non-uniform doping. The sample is 200 µm long: In the figure, L = 200 µm= 0.02 cm. At the x = 0

### Bipolar Junction Transistor Basics

by Kenneth A. Kuhn Sept. 29, 2001, rev 1 Introduction A bipolar junction transistor (BJT) is a three layer semiconductor device with either NPN or PNP construction. Both constructions have the identical

### Semiconductor Physics

10p PhD Course Semiconductor Physics 18 Lectures Nov-Dec 2011 and Jan Feb 2012 Literature Semiconductor Physics K. Seeger The Physics of Semiconductors Grundmann Basic Semiconductors Physics - Hamaguchi

### DIODE CIRCUITS LABORATORY. Fig. 8.1a Fig 8.1b

DIODE CIRCUITS LABORATORY A solid state diode consists of a junction of either dissimilar semiconductors (pn junction diode) or a metal and a semiconductor (Schottky barrier diode). Regardless of the type,