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Na incorporation into Cu(In,Ga)Se2 thin-film solar cell absorbers deposited on polyimide: Impact on the chemical and electronic surface structure.
- Source :
- Journal of Applied Physics; Feb2012, Vol. 111 Issue 3, p034903, 8p, 1 Chart, 6 Graphs
- Publication Year :
- 2012
-
Abstract
- Na has deliberately been incorporated into Cu(In,Ga)Se2 ('CIGSe') chalcopyrite thin-film solar cell absorbers deposited on Mo-coated polyimide flexible substrates by adding differently thick layers of NaF in-between CIGSe absorber and Mo back contact. The impact of Na on the chemical and electronic surface structure of CIGSe absorbers with various Cu-contents deposited at comparatively low temperature (420 °C) has been studied using x-ray photoelectron and x-ray excited Auger electron spectroscopy. We observe a higher Na surface content for the Cu-richer CIGSe samples and can distinguish between two different chemical Na environments, best described as selenide-like and oxidized Na species, respectively. Furthermore, we find a Cu-poor surface composition of the CIGSe samples independent of Na content and - for very high Na contents - indications for the formation of a (Cu,Na)-(In,Ga)-Se like compound. With increasing Na surface content, also a shift of the photoemission lines to lower binding energies could be identified, which we interpret as a reduction of the downward band bending toward the CIGSe surface explained by the Na-induced elimination of InCu defects. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHALCOPYRITE
CHALCOPYRITE crystals
COPPER research
POLYIMIDES
SELENIDES
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 111
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 71716794
- Full Text :
- https://doi.org/10.1063/1.3679604