Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 81: Poster: Energy materials incl. photovoltaics

HL 81.12: Poster

Mittwoch, 2. April 2014, 17:00–20:00, P1

Accuracy comparison for different methods of extraction of parameters of CIGS solar cells — •Jose Fabio Lopez Salas, Jan Keller, and Ingo Riedel — Laboratory for Chalcogenide Photovoltaics, Energy and Semiconductor Research Laboratory, University of Oldenburg

The Shockley equation describes the current density in a solar cell resulting from a voltage bias. Especially the temperature dependent ideality facotr n and saturation current density J0 are usually evaluated to understand the fundamental physical loss mechanisms of solar cells, such as the localization of dominant recombination paths. If these parameters are not properly derived, the Shockley equation may not reflect the real current-voltage (IV) characteristics which leads to misinterpretations of internal electrical losses. In this work a number of methods for extraction of the mentioned parameters are applied to different CIGS solar cells and are compared. The accuracy of the parameters is compared for the cases of light, dark, temperature-dependent and intensity-dependent measurements, while the mean square error of the corresponding fits serves as the quality indicator. The objective is to find a reliable method for extraction of parameters of CIGS solar cells which yields the best possible reproduction of their real IV behaviour and to quantify the inaccuracy of each approach.

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