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HL: Fachverband Halbleiterphysik

HL 17: Poster I

HL 17.30: Poster

Montag, 25. Februar 2008, 16:30–19:00, Poster D

Spatially resolved photoluminescence measurements on Cu(In,Ga)Se₂ absorbers and their analysis by Fourier transforms and Minkowski-operations — •Florian Heidemann, Levent Gütay, Matthias Langenmeyer, and Gottfried H. Bauer — Institute of Physics, University of Oldenburg, Germany

Thin film systems like Cu(In,Ga)Se₂ gain more and more importance in photovoltaics. Such multilayer structures however show significant structural and topological spatial variations which are obviously introduced by polycristallinity. With the help of spatially resolved photoluminescence measurements these variations, which are accompanied by spatial fluctuations in optoelectronic properties such as recombination rates and minority life times, can be measured. For the visualisation and quantification of measurements from Cu(In,Ga)Se₂ multilayer structures 2D Fourier transforms and erosion/dilatation Minkowski-operations (opening functions) are applied. These methods provide an insight in size and shape of the spatial patterns as well as into frequencies of occurrence and distribution of characteristic features. Moreover, the comparison of patterns recorded at different local positions for feature extraction with methods mentioned above allow for the proof whether data sets are statistically representative, say, scan areas are sufficiently large.