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Title: Multiple phases of Cu{sub 2}ZnSnSe{sub 4} detected by room temperature photoluminescence

Cu{sub 2}ZnSnSe{sub 4} based solar cells are promising but suffer from low open circuit voltage relative to their band gap. Additionally, the bandgap as extrapolated from quantum efficiency (QE) measurements varies without clear correlation to the growth conditions. Using room temperature photoluminescence, we show that different materials with different bandgaps coexist within micrometer sized areas of the absorbers. Simulations of the effect of multiple bandgaps on both the absorption and the Shockley-Queisser radiative recombination limit, explain the variations of the bandgap extrapolated from QE and the deficiencies of the solar cell parameters.
Authors:
; ; ; ;  [1]
  1. Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, 4422 Belvaux (Luxembourg)
Publication Date:
OSTI Identifier:
22314293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ELECTRIC POTENTIAL; PHOTOLUMINESCENCE; QUANTUM EFFICIENCY; RECOMBINATION; SIMULATION; SOLAR CELLS; TEMPERATURE RANGE 0273-0400 K