# Dresden 2014 – wissenschaftliches Programm

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# HL: Fachverband Halbleiterphysik

## HL 112: Energy materials: CIGS and related photovoltaics

### HL 112.11: Vortrag

### Freitag, 4. April 2014, 12:15–12:30, POT 112

**Comparative study of different extraction methods of diode parameters of chalcopyrite solar cells** — •Jose Fabio Lopez Salas, Jan Keller, and Ingo Riedel — Laboratory for Chalcogenide Photovoltaics (LCP), Energy and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg

The current-voltage (IV) characteristics of solar cells are typically described by Shockley’s equation. Here, the ideality factor *n* and saturation current density *J*_{0} determine the properties of the diode. They are usually evaluated to reveal electronic loss mechanisms of the investigated solar cell, such as the localization of dominant recombination paths. If these parameters are not properly derived, the simulated diode characteristics may not reflect the real IV characteristics which leads to misinterpretation 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 quantitatively compared. The accuracy of the parameters is verified 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 necessity of an extented two-diode model will be discussed. The objective of this work is to find a method for reliable 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.