Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Focused Session: Inhomogeneous Materials for Solar Cells II

DS 12.1: Topical Talk

Monday, March 20, 2017, 15:00–15:30, CHE 89

Defects in Chalcopyrites — •Susanne Siebentritt — Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg

Chalcopyrites (Cu(InGa)Se2) are used as absorbers in thin film solar cells. Their off-stoichiometry and their polycrystalline structure pose challenges for their semiconductor physical analysis.

The talk will present recent progress in the analysis of recombination centres and their effect on photogenerated carriers by spectral photoluminescence (PL) measurements. On the one hand side they provide information about quasi-Fermi level splitting, which indicates the amount of recombination. On the other they allow to investigate the energy positions of deep defects, which act as recombination centres. PL will be compared to results from admittance spectroscopy (AS), which can also indicate deep defects. In AS, however, it is difficult to distinguish between deep defects, barriers and other interface effects. The comparison between PL and AS indicates that the main steps are rather due to barriers than to deep defects.