Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 68: Photovoltaics: Chalcopyrites II
HL 68.9: Talk
Thursday, March 17, 2011, 12:30–12:45, FOE Anorg
Spatially resolved photoluminescence studies on CuGaSe2 and CuInSe2 thin-films — •Christian Gutsche1, Raquel Caballero2, and Gottfried H. Bauer1 — 1Insitute of Physics, Carl von Ossietzky University Oldenburg, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), Berlin, Germany
Chalcopyrite absorbers such as Cu(In1−x Gax)Se2 as convincingly promising candidates for solar light harvesting due to the grainy structure exhibit a high degree of compositional, optical and electronic inhomogeneities.
We have studied samples of the extreme values of stoichiometry, say x=0, and x=1 by steady state spectrally resolved photoluminescence with lateral resolution of ≤ 1 µm in a confocal cryostat setup. We compare the experimental observations of these two types of absorbers, CuInSe2 with CuGaSe2 with respect to laterally resolved luminescence yields, local splitting of quasi-Fermi levels, local absorption coefficients and local pseudo band gaps, as well as local recombination rates.
Furthermore we discuss the distribution of these magnitudes on the basis of histograms and Minkowski-operations like ’opening’-functions to extract lateral features and determine their pattern sizes.