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DS: Dünne Schichten
DS 20: Dünne Schichten für die Photovoltaik II
DS 20.5: Talk
Thursday, March 11, 2004, 15:30–15:45, HS 32
8% efficient CuInS2 (CIS) solar cells with electrochemically removed Cu-S-phases — •Thomas Wilhelm, Baptiste Berenguier, Mohammed Aggour, Mirko Gaul, Momme Winkelkemper, Michael Kanis, Eder Goncalves, Helmut Jungblut, and Hans-Joachim Lewerenz — Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin
In the pursuit of replacing toxic processing steps and materials in CIS solar cells we have employed various electrochemical conditioning procedures for the removal of the deleterious Cu-S-phases. This development of the electrochemical processing is reviewed and a specific anodisation procedure in a V(II)/V(III) redox electrolyte is presented. Potential profiles encompassing the successive dissolution of CuS, Cu2S and CIS have been applied, resulting in Cu-S-phase free surfaces as evidenced by surface analyses (photoelectron spectroscopy and atomic force microscopy). In a series of efficiency measurements solid state devices with η = 8% were obtained.