Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 25: Organic Electronics and Photovoltaics I
(Joint session of CPP, DS, HL and O, organized by CPP)
DS 25.6: Vortrag
Dienstag, 8. März 2016, 15:15–15:30, H37
Illumination dependent parasitic resistances in organic bulk hetero junction solar cells. — •Arne Hendel and Veit Wagner — Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
During outdoor operation, the solar cell is exposed to AM1.5G during noon only. For other daytimes and for indoor applications the performance of the solar cell at lower light intensities is important. In this study, bulk hetero junction solar cells were exposed to light irradiation from 10−5 to several suns intensity. We find a strong illumination dependence of the parasitic resistances. For the different light intensities I-V characteristics were performed. In addition the Jsc-Voc analysis was done to obtain series resistance free I-V measurement. It was found that the series and shunt resistance, which are critical for the solar cell performance, strongly depend on illumination intensity. The light intensity induced conductivity change of the solar cell shows different dependencies for forward and reverse operation. For low light intensities, the shunt resistance can be directly measured via the open circuit voltage assuming the Shockley model for the diode. From these measurements a strong light dependence is obtained. Based on the experimental data a model for the light dependent shunt resistance and series resistance is presented.