Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 112: Energy materials: CIGS and related photovoltaics

HL 112.9: Talk

Friday, April 4, 2014, 11:45–12:00, POT 112

Systematic investigation of the influence of intentionally created shunts on the cell performance of CIGS-thin film solar cells by lock-in thermography — •Finn Babbe, Jan Keller, Ingo Riedel, Jörg Ohlad, and Jürgen Parisi — Energy- and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg

The efficiency of thin film solar cells and modules can be considerably reduced by local shunts, which may have been introduced in the production process. The corresponding output losses are diverse and depend on the properties of the defect (e.g. the distance to patterning lines). To investigate the effect of its position, size and shape artificial shunts were systematically prepared with a focused ion beam. This method allows the introduction of a broad variety of defined shunt structures in the micrometer range to realize different shunt configurations. The impact of the shunts was studied by lock-in thermography. Applying this technique the local heat (power) dissipation in the modified regions, caused by illumination or bias voltage excitation, was imaged and quantified. The aim of this work is to correlate the heat signatures to the output performance (especially the open circuit voltage and shunt resistance) of CIGS solar cells.