Journal
THIN SOLID FILMS
Volume 519, Issue 21, Pages 7464-7467Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2010.12.140
Keywords
Cu(In,Ga)Se-2; Solar cell; Paste coating; Carbon layer; Back contact interface; Thin absorber layers
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Funding
- Karlsruhe School of Optics and Photonics (KSOP)
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For paste-coated Cu(In,Ga)Se-2 (CIGS) absorber layers used for thin film solar cells one often gets a residual carbon layer between back contact and absorber layer. We investigate the influence of this layer on the solar cells' performance with co-evaporated CIGS absorbers and find a beneficial effect. The power conversion efficiencies of thin chalcopyrite absorber layers are often limited by the influence of back contact recombination. It is assumed that the carbon layer between the back contact and the absorber layer helps lower this recombination and allows higher open circuit voltages and thus higher conversion efficiencies. (C) 2010 Elsevier B.V. All rights reserved.
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