Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.17: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Hybrid Organic-Inorganic Heterojunctions made of Doped Crystalline Silicon and a Hole Conducting Polymer — •Helmut Nesswetter, Sabrina Niesar, Roland Dietmüller, and Martin Stutzmann — Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany

There is an increasing research activity in hybrid heterojunctions made of organic semiconductors and inorganic semiconductors, due to their possible applications for photovoltaic and optoelectronic devices. However, a fundamental understanding of such material systems is still lacking. As a model system, we have studied hybrid heterojunctions made of crystalline silicon (Si) and the organic hole conductor poly(3-hexylthiophene-2,5-diyl) (P3HT) to gain insight into the electronic processes at the heterojunction. The heterojunctions were fabricated by spin coating a P3HT layer from solution on n-type or p-type Si wafers with an ohmic metal back contact. Afterwards, a semitransparent aluminium or a transparent indium tin oxide (ITO) front contact was applied on top of the P3HT layer. These devices were characterized via current-voltage and spectrally resolved photocurrent measurements. Depending on the use of n-type or p-type Si and on the use of Al or ITO as a front contact, we have observed different current-voltage characteristics for the P3HT/Si heterojunctions. This can be explained by the interplay of the Si/P3HT heterojunction, which is influenced by the doping level of the Si substrate and the P3HT/Metal contact, which can form a Schottky diode.