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Impedance spectroscopy on organic bulk-heterojunction solar cells

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

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
214 KB
Volume
202
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

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 °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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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