Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.64: Poster

Thursday, March 17, 2011, 18:00–21:00, P4

Series resistance mapping of Cu(In,Ga)Se₂ solar cells by voltage dependent electroluminescence — •Felix Daume^1,2, Christian Scheit¹, Stefan Puttnins^1,2, Andreas Rahm¹, and Marius Grundmann² — ¹Solarion AG, Ostende 5, 04288 Leipzig, Germany — ²Institut für Experimentelle Physik II, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany

Cu(In,Ga)Se₂ (CIGSe) thin film solar cells deposited on flexible polyimide foil promising innovative applications and a fabrication in continuous roll-to-roll processes currently reach efficiencies up to 17.6 %.

The optimization of the solar cell efficiency requires the reduction of inherent losses in the cell. In order to achieve this goal preferably spatially resolved access to parameters characterizing ohmic losses like series and shunt resistances are indispensable.

We will apply an interpretation method for electroluminescence (EL) images taken at different voltages which is known for solar cells made of crystalline silicon from literature to solar cells made of polycrystalline CIGSe. The theory of this method to obtain a mapping of the series resistance and the EL imaging process as well as the data interpretation will be reviewed and demonstrated on an example. Furthermore, the benefit of this method for the characterization of solar cells under accelerated aging conditions (damp heat) which is important for the estimation of the long-term stability will be shown.