TY  - GEN
N2  - In this work the potential distribution within organic solar cells was investigated. Using a focused ion beam micrometer sized holes were milled into the cells such that the cross sections became accessible by scanning Kelvin probe microscopy (SKPM). SKPM measurements were performed on Poly(3-hexylthiophen) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) solar cells under illumination and under different bias voltages. In a bilayer solar cell the applied bias voltage drops at the interface between P3HT and anode and within the organic layer. In a bulk heterojunction solar cell the potential drops at the interface between P3HT and the anode and at the interface between the PCBM and cathode. In solar cells which were inverted due to altered contact materials there is no potential drop at the contacts, but the potential uniformly
drops within the organic material. It can be concluded that an inverted device structure is more favorable for this morphology of the bulk heterojunction. The open circuit voltage exhibited a similar distribution within the device as an external applied bias voltage. Furthermore, SKPM measurements were performed on solar cells with S-shaped current-voltage characteristics. It was mapped that the S-shape behavior results from a transport barrier at the cathode interface.
AV  - public
ID  - heidok16260
A1  - Saive, Rebecca
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/16260/
TI  - Investigation of the Potential Distribution within Organic Solar Cells by Scanning Kelvin Probe Microscopy
Y1  - 2014///
ER  -