Photocurrent action spectroscopy in organic photovoltaic cells

The organic materials Cu-phthalocyanine and the bisarylamidine-perylenes BB P-perylene possess the advantages of cheap processing, high stability, elec tron-donating resp. accepting-properties and absorption-spectra covering a wide range of the solar irradiance spectrum favoring their application in p hotovoltaic cells. We have used IV-characterization and photocurrent action spectroscopy to examine the predictions of a theoretical model describing the dependency of the power conversion efficiency on the thickness of the a ctive layer. The photocurrent response is governed by the internal filter e ffect as well as the absorption density distribution in the device.