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.

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