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Title: Time-resolved photoluminescence measurements for determining voltage-dependent charge-separation efficiencies of subcells in triple-junction solar cells

Conventional external quantum-efficiency measurement of solar cells provides charge-collection efficiency for approximate short-circuit conditions. Because this differs from actual operating voltages, the optimization of high-quality tandem solar cells is especially complicated. Here, we propose a contactless method, which allows for the determination of the voltage dependence of charge-collection efficiency for each subcell independently. By investigating the power dependence of photoluminescence decays, charge-separation and recombination-loss time constants are obtained. The upper limit of the charge-collection efficiencies at the operating points is then obtained by applying the uniform field model. This technique may complement electrical characterization of the voltage dependence of charge collection, since subcells are directly accessible.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Institute for Chemical Research and JST-CREST, Kyoto University, Uji, Kyoto 611-0011 (Japan)
  2. Institute for Solid State Physics and JST-CREST, The University of Tokyo, Kashiwa, Chiba 277-8581 (Japan)
  3. Japan Aerospace Exploration Agency, Tsukuba, Ibaraki 305-8505 (Japan)
Publication Date:
OSTI Identifier:
22395681
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CHARGE COLLECTION; ELECTRIC CONTACTS; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; OPTIMIZATION; PHOTOLUMINESCENCE; QUANTUM EFFICIENCY; RECOMBINATION; SEMICONDUCTOR JUNCTIONS; SOLAR CELLS; TIME RESOLUTION