Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 657, Issue -, Pages 408-413Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.09.198
Keywords
CZTS; CZTSe; X-ray diffraction; WDX spectroscopy; Rietveld refinement
Categories
Funding
- KESTCELLS [316488]
- FP7-PEOPLE ITN
- Multi-ITN
- HZB Graduate School MatSEC (Materials for Solar Energy Conversion)
- IRSES PVICOKEST [26916]
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In this work the flexibility of the kesterite structure is discussed. It is shown that kesterite type CZTS and CZTSe can deviate from stoichiometric composition by the formation of intrinsic point defects leading to different off-stoichiometric kesterite types. For this study off-stoichiometric CZTS and CZTSe powder samples have been synthesized by solid state reaction from pure elements. Their chemical composition was determined by WDX spectroscopy and the structural characterization was conducted by X-ray diffraction. Amongst the studied 49 samples, a number of them have been identified to contain only an off-stoichiometric kesterite type phase which exhibit Cu-poor/Zn-rich composition. On the other hand, Cu-rich/Zn-poor kesterite type CZTS and CZTSe always coexists with secondary phases. Thus it has been demonstrated, that the kesterite type structure can self-adapt to Cu-poor and Cu-rich compositions in CZTS and CZTSe without any structural change except the cation distribution. (C) 2015 Elsevier B.V. All rights reserved.
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