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Impedance spectroscopy on organic bulk-heterojunction solar cells

: Glatthaar, M.; Mingirulli, N.; Zimmermann, B.; Ziegler, T.; Kern, R.; Niggemann, M.; Hinsch, A.; Gombert, A.


Physica status solidi. A 202 (2005), No.11, pp.R125-R127
ISSN: 0031-8965
ISSN: 1862-6300
ISSN: 1521-396X
ISSN: 1862-6319
Journal Article
Fraunhofer ISE ()

We measured the electrical impedance spectra of organic bulk-heterojunction solar cells based on an absorber blend of poly(3-hexylthiophene) and [6,6]-phenyl C-61-butyric acid methyl ester. Comparing the spectra of the non-treated device and after two consecutive treatments with applied forward bias voltage at 110 degrees C, we observed a region in the semiconductor with a low conductivity, which was expanding after the treatments. We concluded that this region is a depletion region at the aluminium contact. This was confirmed by the bias dependence of the impedance spectra.