Title

Band Alignment At The Cds Cu (In,Ga) S2 Interface In Thin-Film Solar Cells

Abstract

The band alignment at the CdS Cu (In,Ga) S2 interface in thin-film solar cells on a stainless steel substrate was investigated using photoelectron spectroscopy and inverse photoemission. By combining both techniques, the conduction and valence band offsets were independently determined. We find an unfavorable conduction band offset of -0.45 (±0.15) eV, accounting for the generally observed low open-circuit voltage and indicating the great importance of the bufferabsorber conduction band offset for such devices. The surface band gap of the Cu (In,Ga) S2 absorber is 1.76 (±0.15) eV, being increased with respect to the expected bulk value by a copper depletion near the surface. © 2005 American Institute of Physics.

Publication Date

2-7-2005

Publication Title

Applied Physics Letters

Volume

86

Issue

6

Number of Pages

1-3

Document Type

Article

DOI Link

https://doi.org/10.1063/1.1861958

Socpus ID

18644386193 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/18644386193

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