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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.18: Poster
Monday, March 7, 2005, 18:00–20:00, Poster TU A
Thin film photovoltaic cells of DIP/CuPc and DIP/F16CuPc bilayers and mixed layers — •Philipp Neumann and Jens Pflaum — 3. Physikalisches Institut, Universität Stuttgart, Germany
Wavelength dependent photocurrent measurements on DIP/CuPc and DIP/F16CuPc photovoltaic (PV) cells are presented and correlated to their structural properties obtained by x-ray diffraction. The choice of material is motivated by their complementary absorption regions over a broad spectral range and by the high degree of structural order. The molecular bilayer and mixed layer, each of them between 100−300 nm thick, were prepared by thermal evaporation of the organic compounds under vacuum (10−8 mbar), As bottom contact ITO covered glass and as top contact a thin transparent Ag layer were used. Whereas for the organic bilayer cells the individual optical properties of the layers yield a symbatic behavior of the photocurrent, for the mixed layer PV-cells, pronounced deviations in the optical absorption and in the spectral photocurrent were observed. Taking into account the increase of the effective interface region, we discuss this result in context of the respective energy levels of DIP, CuPc and F16CuPc and of the possible formation of a hetero-charge transfer complex.