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Alternative Etching for Improved Cu-rich CuInSe2 Solar Cells

Published online by Cambridge University Press:  12 May 2015

Valérie Deprédurand ,
Tobias Bertram ,
Maxime Thévenin ,
Nathalie Valle ,
Jean-Nicolas Audinot  and
Susanne Siebentritt
Valérie Deprédurand
Affiliation:
Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, 41 rue du Brill, 4422 Belvaux, Luxembourg
Tobias Bertram
Affiliation:
Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, 41 rue du Brill, 4422 Belvaux, Luxembourg
Maxime Thévenin
Affiliation:
Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, 41 rue du Brill, 4422 Belvaux, Luxembourg
Nathalie Valle
Affiliation:
Materials Research and Technology, Luxembourg Institute of Science and Technology, 41 rue du Brill, 4422 Belvaux, Luxembourg
Jean-Nicolas Audinot
Affiliation:
Materials Research and Technology, Luxembourg Institute of Science and Technology, 41 rue du Brill, 4422 Belvaux, Luxembourg
Susanne Siebentritt
Affiliation:
Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, 41 rue du Brill, 4422 Belvaux, Luxembourg
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Abstract

Two alternative chemical etchings (aqueous solution of bromine and bromine methanol solution) have been here tested to replace the KCN etching step in Cu-rich CuInSe2 based solar cells fabrication process. This new oxidative etch aims also at smoothing and thinning the as-grown films. This directly affects the interface between the absorber and the CdS buffer, interface which causes problems for Cu-rich solar cells. We present here the effect of these two alternative etchings on both the absorber surface and the solar cells parameters: whereas the bromine methanol etching destroys the solar cell, the aqueous solution of bromine leads to an improvement of the device through reduced interface and tunneling enhanced recombination.

Keywords

thin filmphotovoltaicphysical vapor deposition (PVD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1771: Symposium B/C/D/E – Recent Advances in Photovoltaics , 2015 , pp. 163 - 168
Copyright
Copyright © Materials Research Society 2015 

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References

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