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Title: Trap and recombination centers study in sprayed Cu₂ZnSnS₄ thin films

In this work, a study of trap and recombination center properties in polycrystalline Cu₂ZnSnS₄ thin films is carried out in order to understand the poor performance in Cu₂ZnSnS₄ thin film solar cells. Thermally stimulated current has been studied in Cu₂ZnSnS₄ deposited by pneumatic spray pyrolysis method using various heating rates, in order to gain information about trap centers and/or deep levels present within the band-gap of this material. A set of temperature-dependent current curves revealed three levels with activation energy of 126±10, 476±25, and 1100±100 meV. The possible nature of the three levels found is presented, in which the first one is likely to be related to Cu{sub Zn} antisites, while second and third to Sn vacancies and Sn{sub Cu} antisites, respectively. The values of frequency factor, capture cross section, and trap concentration have been determined for each center.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Escuela Superior de Física y Matemáticas-Instituto Politécnico Nacional (IPN), C.P. 07738, México DF (Mexico)
  2. (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Barcelona (Spain)
  3. Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Barcelona (Spain)
Publication Date:
OSTI Identifier:
22305771
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; COPPER COMPOUNDS; CROSS SECTIONS; GAIN; HEATING RATE; POLYCRYSTALS; PYROLYSIS; QUATERNARY ALLOY SYSTEMS; RECOMBINATION; SOLAR CELLS; SPRAYS; SULFUR COMPOUNDS; TEMPERATURE DEPENDENCE; THIN FILMS; TIN COMPOUNDS; TRAPS; VACANCIES; ZINC COMPOUNDS