Article (Scientific journals)
Formation of nanometer-sized Cu-Sn-Se particles in Cu2ZnSnSe4 thin-films and their effect on solar cell efficiency
Schwarz, Torsten; Cojocaru-Miredin, Oana; Mousel, Marina et al.
2017In ACTA MATERIALIA, 132, p. 276-284
Peer reviewed
 

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Abstract :
[en] Atom probe tomography and transmission electron microscopy are used to study the formation of nano sized Cu-Sn-Se particles in Cu2ZnSnSe4 thin -films. For a Cu -rich precursor, which was deposited at 320 degrees C under Cu- and Zn-rich growth conditions, Cu2-xSe grains at the surface are detected. During annealing the precursor at 500 degrees C in a SnSe + Se atmosphere most of the Cu2-xSe is transformed to Cu2ZnSnSe4 via the consumption of excessive ZnSe and incorporation of Sn. However, atom probe tomography studies also reveal the formation of various nanometer-sized Cu-Sn-Se particles close to the CdS/Cu(2)ZnSnSe4 interface. One of those particles has a composition close to the Cu2SnSe3 compound. This phase has a smaller band gap than Cu2ZnSnSe4 and is proposed to lead to a significant drop in the open -circuit voltage and could be the main cause for a detrimental p-n junction and the zero efficiency of the final device. Possible effects of the other phases on solar cell performance and formation mechanisms are discussed as well. (C)2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Disciplines :
Physics
Author, co-author :
Schwarz, Torsten
Cojocaru-Miredin, Oana
Mousel, Marina
Redinger, Alex ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Raabe, Dierk
Choi, Pyuck-Pa
External co-authors :
yes
Language :
English
Title :
Formation of nanometer-sized Cu-Sn-Se particles in Cu2ZnSnSe4 thin-films and their effect on solar cell efficiency
Publication date :
2017
Journal title :
ACTA MATERIALIA
Volume :
132
Pages :
276-284
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
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since 22 November 2017

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