Wafer-based silicon PV technology Status, innovations and outlook
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1 Wafer-based silicon PV technology Status, innovations and outlook Wim Sinke ECN Solar Energy, Utrecht University & European PV Technology Platform
2 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
3 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
4 Wafer-based crystalline silicon Bell - ½ century of manufacturing experience - huge technology base (materials, processes & device designs) - extensive track record (performance, lifetime & reliability - highest performance of flat-plate technologies - further cost reduction (preserving efficiency) is main overall challenge
5 Cell & module technologies ( flat plate ) Commercial: wafer-based crystalline silicon - monocrystalline (cut) - multicrystalline (cut) - ribbons ( 80% of global market) ECN Commercial: thin films - silicon - copper-indium/gallium-diselenide (CIGS) - cadmium telluride (CdTe) ( 20% of global market) Helianthos ECN/Holst Centre Nanosolar Pilot production and laboratory: emerging and novel technologies - super-low-cost concepts (printed organic & inorganic, etc.) - super-high-efficiency concepts
6 Cell & module technologies ( flat plate ) Commercial: wafer-based crystalline silicon module efficiencies 13 ~ 19% ECN Commercial: thin films module efficiencies 6 ~ 12% Helianthos Pilot production and laboratory: emerging and novel technologies ECN/Holst Centre Nanosolar (various efficiencies; most not yet commercially available)
7 The silicon PV value chain Silicon feedstock Crystal Wafer Solar cell Solar module PVsystem Solar electricity
8 Typical current industrial silicon solar cell B-doped substrate (base) P-doped front (emitter) Al-doped rear (back surface field, BSF) SiN anti-reflection coating / passivation layer Ag contacts
9 Cell design options Standard: front emitter Rear emitter / front surface field Sanyo Heterojunction Metallisation Wrap Through (MWT) Emitter Wrap Through (EWT) SunPower Back Junction Back Contact (BJBC) Carrier collection at front Carrier collection at rear Front and rear contacted All rear contacted 9
10 World record monocrystalline silicon cell (efficiency 25.0%) Passivated Emitter and Rear Locally diffused (PERL) cell Zhao, Wang & Green, UNSW (1999)
11 World record monocrystalline silicon large-area module (efficiency 21.4%) based on Interdigitated Back Junction, Back Contact cells Courtesy SunPower Corp. ancestor (1986): Point Contact Solar Cell (>28% under concentration) Swanson, Sinton & King
12 Very high efficiency monocrystalline silicon large-area module (efficiency %) based on HIT (Heterojunction with Intrinsic Thin layer) cells Courtesy Sanyo Electric Co., Ltd.
13 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
14 Historic efficiency development crystalline silicon cells and modules (rounded values) 30 best laboratory cells (monocrystaline Si) best laboratory cell (multicrystalline Si) typical commercial modules 5 Year Efficiency [%] 25
15 Photovoltaic conversion: basic process and losses recombination energy gap (Si: 1.12 ev) X X X generation
16 Solar spectrum and spectral losses 1.6 UV visible infrared solar spectrum (Air Mass 1,5; 1000 W/m2) power [W/(m2.nm)] available for conversion in crystalline Si 1.2 X 1100 nm 1.1 ev = Si bandgap X wavelength [nm] courtesy John Schermer, KUN Courtesy John Schermer, RUN, NL
17 current Solar cell electrical characteristic: voltage and curve factor losses Voc Jsc FF 1 Pmax Vmax voltage Voc Jsc FF Plight Imax Jmax J J0 e qv kt 1 JL Pmax VOC kt J L ln 1 Egap q J0
18 Crystalline silicon solar cell conversion efficiencies: limits and losses (indicative)
19 From lab to fab Trade-off between cost & performance Small area large area Best average Lower Si material quality, highly doped regions, surfaces and contacts additional recombination: Jsc, Voc Additional optical losses (reflection & transmission): Jsc Additional resistive losses: FF Efficiency range multicrystalline Si cells: ~14-17% Efficiency range monocrystalline Si cells : ~16-22%
20 Selected options for further improvement Minimize recombination: - improve material quality manage defects and impurities, use n-type Si - reduce heavy doping effects local doping, selective emitters - effective surface passivation SiNx, SiO2, Al2O3, asi, etc. - low-recombination contacts heterojunctions Minimize optical losses - reduce reflection, apply light trapping coatings & textures, plasmonic structures? - reduce shadow losses rear contact designs Minimize resistive losses - increase conductance advanced electrode architectures and materials, rear contact designs
21 Example: understanding and managing impurities
22 Understanding and managing impurities: effects of Fe, Ni, Cr added to Si feedstock Bottom Middle Top Efficiency [%] Ref Fe 50 ppm wt 12 Cr 40 ppm wt 10 Ni 40 ppm wt Fe 200 ppm wt 8 0% 20% 40% 60% Position in the ingot [%] 80% 100%
23 Understanding and managing impurities: replace p-type Si by n-type Si (n+) Phosphorous emitter (p+) Boron emitter Tio/+ Ti+/o Fe+/o Back contact B-O2i p-type silicon substrate Feo/+ (n+) n-type silicon substrate Phosphorus BSF Major metal impurities positively charged in p-type, neutral in n-type. p-type dopant B forms B-O recombination center
24 Example: the importance of low-recombination contacts VOC kt J L ln 1 q J 0 e J 0b J 0e fcont J 0e, cont (1 fcont ) J 0, pass Well-passivated emitter: ~30 fa/cm2 or less Ohmic contacts: ~ fa/cm2 With only 5% contact coverage, fa/cm2 from contacts
25 Low-recombination contacts Transfer majority carriers without (resistive) loss Reflect minority carriers without recombination loss minority carrier mirrors Practical solution: - silicon heterojunction contacts Graph: Miro Zeman, DUT, NL,
26 Example: apply light trapping Full absorption (even) in very thin substrates low bulk recombination (high Voc) combined with high Jsc allow the use of low-quality materials plasmon pictures Amolf
27 Example: The best of both worlds (SunPower & Sanyo) the IBC-HIT cell No shadow losses on front No optical absorption losses on front Very low contact recombination at rear (beyond asi) M. Tucci et al., BEHIND cell concept Work in collaboration with Univ. Rome, ENEA, ECN, Univ. Utrecht, and others
28 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
29 Anatomy of a standard module Module consists of: - glass superstrate - encapsulant (EVA) - interconnected solar cells - encapsulant (EVA) - rear-side foil Finishing: - framing - junction box - cabling and wiring
30 Example: Metallisation Wrap-Through (MWT) cell A n+ Base: p n+ A Base: p Cross-section AA n+ Base: p n+ Base: p n+ Base: p
31 MWT cells & module: single-shot module manufacturing inspired by Surface-Mount Technology (SMT) Photo: GEC, Inc.
32 Design and manufacture of MWT module Rear of cell Section of conductive foil Equipment by Eurotron (NL)
33 MWT cells and modules Technology µm (Deutsche Solar) - and 160 µm (REC) mc-si wafers Conductive adhesive (alternative: low-t solder) Patterned rear-side foil Novel module line; zero cell breakage Module results - Aperture area efficiency: % (120 µm cells) % (160 µm; 17.8% cells)
34 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
35 How far can wafer Si module cost go down? h
36 Cost structure of wafer Si PV (2009) From Peter Fath, Centrotherm,
37 Contents Wafer-based silicon photovoltaics - features - market position - history and state-of-the-art Cell and module efficiencies - achievements so far - limiting factors - options for further improvement Towards integration of cell and module designs Cost reduction potential Outlook
38 Crystalline silicon: first generation PV? picture
39 Energy pay-back time of turn-key PV systems Mariska de Wild-Scholten, Environmental Sustainability of Thin Film PV 2nd EPIA International Thin Film Conference, 12 November 2009, Munich
40 Carbon footprint of selected electricity generating technologies Mariska de Wild-Scholten, Environmental Sustainability of Thin Film PV 2nd EPIA International Thin Film Conference, 12 November 2009, Munich 40
41 Greenpeace 9 March
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