Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.44: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Photocurrent action spectra and X-ray diffraction on diindenoperylene/pentacene heterostructures — •D. Kurrle, S. Hirschmann, and J. Pflaum — III. Physikalisches Institut, Universität Stuttgart, Germany

As a new candidate for photovoltaic applications, thin films of the organic semiconductors diindenoperylene (DIP, C₃₂H₁₆) and pentacene (C₂₂H₁₄) were prepared and examined by measuring the absorption and photocurrent action spectra.

Samples of different structures were grown by thermal evaporation, using ITO and silver as electrode materials. DIP/pentacene double layers as well as co-evaporated mixed layers were studied (both 100-250 nm in total thickness), both yielding considerable photocurrents up to 50 nA/cm² under the applied conditions.

Furthermore, X-ray diffraction and AFM were carried out to obtain additional information on the structure of the films. The growth of the DIP/pentacene bilayers showed a pronounced structural dependence on the substrate temperature (140-400 K) and the underlying electrode material, whereas the impact on the photocurrent emerged to be minor.