Dresden 2003 – scientific programme

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HL: Halbleiterphysik

HL 30: Photovoltaik

HL 30.13: Talk

Wednesday, March 26, 2003, 17:30–17:45, BEY/81

Investigation of correlation between the Ga-content in Cu(In,Ga)Se₂ solar cells and cell parameters — •Verena Mertens¹, Vladimir Dyakonov¹, Jürgen Parisi¹, Rolf Reineke-Koch², Marc Köntges², and Robert Kniese³ — ¹Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg — ²Institut für Solarenergieforschung Hameln/Emmerthal, Am Ohrberg 1, 31860 Emmerthal — ³Zentrum für Sonnenenergie- und Wasserstoff-Forschung, He ß brühlstr. 21c, 70565 Stuttgart

In the field of thin films solar cells, devices that employ Cu(In,Ga)Se₂ (CIGS) absorbers show promising efficiencies. The absorber material used has a Ga/(In+Ga)-content of about 25 %. This optimum composition was found empirically, but the reasons for this are not yet well understood. Using admittance spectroscopy and deep level transient spectroscopy (DLTS) we investigate solar cells with different Ga-contents. The defects and defect concentrations are compared with the parameters of the solar cells.