Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Poster I
HL 17.33: Poster
Montag, 25. Februar 2008, 16:30–19:00, Poster D
Lateral Inhomogeneities in CuInS2-Thin Film Absorbers by Confocal Optical and Spectroscopic Analyses With µ m-Lateral Resolution — •Martin Suhlmann1, Sebastian Meier1, Levent Gütay1, Alexander Meeder2, Rudolf Brüggemann1, and Gottfried H. Bauer1 — 1Institute of Physics, Carl von Ossietzky University Oldenburg, F.R.Germany — 2Sulfurcell Solartechnik G.m.b.H., Berlin
CuInS2-absorbers from runs for thin film pv-module production have been analyzed by confocal spectrally resolved photoluminescence (PL) and focused spectral white light transmission. We observe in 300K-experiments substantial lateral variations in PL-yield, spectral shapes, and white light spectral transmission, potentially originating from the grainy structure, which we interpret in terms of lateral variations in element composition, defect densities and according lateral fluctuations of the splitting of quasi-Fermi levels (EFn−EFp). In histograms we show the distribution of fluctuations of (EFn−EFp) and extract half widths and higher order momenta. The comparison with CIS-absorbers of lab cells prepared under differing conditions and with data from selenide chalcopyrites, such as Cu(In,Ga)Se2 show weaker fluctuation of the latter ones.