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Title: Temperature-dependent photocarrier recombination dynamics in Cu{sub 2}ZnSnS{sub 4} single crystals

Time-resolved photoluminescence (PL) measurements have been used to study the temperature-dependent photocarrier recombination dynamics in Cu{sub 2}ZnSnS{sub 4} (CZTS) single crystals. We found a significant change of nearly four orders of magnitude of the PL decay time, from microseconds at low temperatures to subnanoseconds at room temperature. The slow PL decay at low temperatures indicates localization of the photocarriers at the band tails. Due to the large band tail states, the PL decay time depends strongly on both the photon energy and excitation density. It is pointed out that the drastically enhanced nonradiative recombination at high temperatures is one of the main factors that determine the power conversion efficiency of CZTS-based solar cells.
Authors:
;  [1] ;  [2] ; ;  [1] ; ;  [3]
  1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)
  2. (Japan)
  3. Department of Applied Physics and Electronic Engineering, University of Miyazaki, Miyazaki 889-2192 (Japan)
Publication Date:
OSTI Identifier:
22293101
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; Other Information: (c) 2014 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; 14 SOLAR ENERGY; CONVERSION; COPPER COMPOUNDS; EFFICIENCY; EXCITATION; MONOCRYSTALS; PHOTOLUMINESCENCE; RECOMBINATION; SOLAR CELLS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TIME RESOLUTION; TIN SULFIDES