Impact of sulphurization environment on formation of $$\hbox {Cu}_{2}\hbox {ZnSnS}_{4}$$ Cu 2 ZnSnS 4 films using electron beam evaporated stacked metallic precursors

Kannan, P K and Chaudhari, Sushmita and Dey, Suhash Ranjan (2019) Impact of sulphurization environment on formation of $$\hbox {Cu}_{2}\hbox {ZnSnS}_{4}$$ Cu 2 ZnSnS 4 films using electron beam evaporated stacked metallic precursors. Bulletin of Materials Science, 42 (1). ISSN 0250-4707

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Abstract

The superiority of copper zinc tin sulphide ( Cu2ZnSnS4 ; CZTS) over the existing absorber layer materials is inevitable owing to its cheap, non-toxic and earth abundant constituents with high absorption coefficient value. In the present study, CZTS films are prepared by sulphurizing electron beam deposited precursors of glass/Cu/Zn/Sn/Cu and glass/Cu/Sn/Zn/Cu stacking sequences in two different environments i.e., elemental S powder and 5% H2S+N2 gas at different ramping rates. The effect of sulphurization environment and sulphurization ramping rate on the formation of CZTS is investigated using X-ray diffraction and Raman spectroscopy. The morphology and composition of the films are analysed respectively using field emission gun scanning electron microscopy and energy dispersive X-ray spectroscopy. It is observed that films prepared in elemental S powder at a low ramping rate exhibit better crystallinity with less impurity phases. The presence of ZnS is observed in all the films, while the presence of SnS is observed in films prepared with H2S gas alone, thus concluding that sulphurization in the presence of elemental S powder at a low ramping rate is highly favourable for CZTS film formation. CZTS films with minor ZnS impurity with a bandgap of 1.48 eV is successfully fabricated by using a glass/Cu/Zn/Sn/Cu precursor stack.

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IITH Creators:
IITH CreatorsORCiD
Dey, Suhash Ranjanhttp://orcid.org/0000-0002-5148-9534
Item Type: Article
Uncontrolled Keywords: Electron beam evaporation, ramping rate, CZTS
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 22 Jan 2019 11:57
Last Modified: 22 Jan 2019 11:57
URI: http://raiith.iith.ac.in/id/eprint/4746
Publisher URL: http://doi.org/10.1007/s12034-018-1726-8
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