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Title: Impact of sub-cell internal luminescence yields on energy conversion efficiencies of tandem solar cells: A design principle

To develop a realistic design principle, we calculated the maximum conversion efficiency η{sub sc} and optimized sub-cell band-gap energies E{sub g} in double-junction tandem solar cells via a detailed-balance theory, paying particular attention to their dependence on internal luminescence quantum yields y{sub int} of the top and bottom sub-cell materials. A strong drop in the maximum η{sub sc} occurs when y{sub int} slightly drops from 1 to 0.9, where the drop in y{sub int} of the bottom cell causes a stronger effect than that of the top cell. For low values of y{sub int}, the maximum η{sub sc} has a simple logarithmic dependence on the geometric mean of the two sub-cells'y{sub int}.
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Institute for Solid State Physics, University of Tokyo and JST-CREST, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)
  2. Institute for Chemical Research, Kyoto University and JST-CREST, Uji, Kyoto 611-0011 (Japan)
Publication Date:
OSTI Identifier:
22280578
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 30 DIRECT ENERGY CONVERSION; DESIGN; ENERGY CONVERSION; ENERGY EFFICIENCY; LUMINESCENCE; QUANTUM EFFICIENCY; SEMICONDUCTOR JUNCTIONS; SOLAR CELLS; YIELDS