Journal
SOLAR ENERGY
Volume 141, Issue -, Pages 236-241Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2016.11.035
Keywords
Kesterite solar cells; Thin films; Thermal evaporation; Zn(O,S) buffer layer
Categories
Funding
- DAAD project (INTERKEST) [57050358]
- Marie Curie-ITN (KESTCELLS) [316488]
- MINECO project (SUNBEAM) [ENE2013-49136-C4-3-R]
- Spanish MINECO within the Ramon y Cajal program [RYC-2011-08521, RYC-2011-09212]
- Government of Spain [BES-2014-068533]
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Cu2ZnSnS4 thin films have been produced via rapid thermal evaporation of off-stoichiometric kesterite powder followed by annealing in an Ar atmosphere. Different heating rates were applied during the thermal treatments. The chemical composition and structural properties of the deposited layers as well as the distribution of the elements through the kesterite thin film have been investigated. The initial growth of a SnS secondary phase during evaporation led to the formation of this secondary phase next to the Mo back contact. Solar cell power conversion efficiencies were limited to values about 3% due to this secondary phase. Furthermore, an increased open circuit voltage was demonstrated by using a Zn(O,S) buffer layer. (C) 2016 Elsevier Ltd. All rights reserved.
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