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Title: Atom-probe tomographic study of interfaces of Cu{sub 2}ZnSnS{sub 4} photovoltaic cells

The heterophase interfaces between the CdS buffer layer and the Cu{sub 2}ZnSnS{sub 4} (CZTS) absorption layers are one of the main factors affecting photovoltaic performance of CZTS cells. We have studied the compositional distributions at heterophase interfaces in CZTS cells using three-dimensional atom-probe tomography. The results demonstrate: (a) diffusion of Cd into the CZTS layer; (b) segregation of Zn at the CdS/CZTS interface; and (c) a change of oxygen and hydrogen concentrations in the CdS layer depending on the heat treatment. Annealing at 573‚ÄČK after deposition of CdS improves the photovoltaic properties of CZTS cells probably because of the formation of a heterophase epitaxial junction at the CdS/CZTS interface. Conversely, segregation of Zn at the CdS/CZTS interface after annealing at a higher temperature deteriorates the photovoltaic properties.
Authors:
; ; ; ;  [1] ; ;  [2]
  1. Toyota Central R and D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192 (Japan)
  2. Northwestern University, Evanston, Illinois 60208-3108 (United States)
Publication Date:
OSTI Identifier:
22311043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 9; 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; ABSORPTION; ANNEALING; BUFFERS; CADMIUM SULFIDES; COPPER COMPOUNDS; DIFFUSION; DISTRIBUTION; ELECTRIC CONTACTS; EPITAXY; INTERFACES; LAYERS; PHOTOVOLTAIC CELLS; PHOTOVOLTAIC EFFECT; SEGREGATION; SEMICONDUCTOR JUNCTIONS; SULFUR COMPOUNDS; THREE-DIMENSIONAL CALCULATIONS; TIN COMPOUNDS; ZINC COMPOUNDS