Effects of compression and controlled selenization on powder-fabricated Cu (In,Ga)Se-2 thin films

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Cu(In,Ga)Se-2 thin films have been used as a light absorbing layer in high-efficiency solar cells. Among many methods, the powder process for fabricating Cu(In,Ga)Se-2 thin films is advantageous, due to its simplicity and minimal usage of materials. However, Cu(In,Ga)Se-2 layers produced by the powder process often result in high porosity and small grain sizes, which has been a significant barrier to wide application. In this report, we demonstrate that simple compression of the Cu(In,Ga)S-2 powder coat and a cost-efficient selenization using a mixture of Se and Al2O3 can reduce porosity and enlarge the grain size. It is surmised that improved particle packing density in the powder coats, in addition to sintering with a steady supply of Se vapor, synergistically enhances highly sintered Cu(In,Ga)Se-2 thin films.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2019-05
Language
English
Article Type
Article; Proceedings Paper
Citation

APPLIED SURFACE SCIENCE, v.475, pp.158 - 161

ISSN
0169-4332
DOI
10.1016/j.apsusc.2018.12.196
URI
http://hdl.handle.net/10203/251610
Appears in Collection
RIMS Journal Papers
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