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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 1: Organic Photovoltaics I

SYOP 1.7: Vortrag

Mittwoch, 25. März 2009, 15:30–15:45, ZEU 222

Hybrid Organic-Inorganic Bulk Heterojunctions with Silicon Nanocrystals for Solar Cells — •Sabrina Niesar¹, Roland Dietmüller¹, André Ebbers², Martin Trocha², Hartmut Wiggers³, and Martin Stutzmann¹ — ¹Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany — ²Evonik Degussa GmbH, Paul-Baumann-Str.1, 45772 Marl, Germany — ³Institut für Verbrennung und Gasdynamik, Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany

Hybrid organic-inorganic solar cells, which incorporate both, organic and inorganic semiconductors, have received a lot of attention during the last years. Such solar cells typically consist of a bulk heterostructure made of organic semiconducting polymers and semiconducting nanocrystals. These hybrid organic-inorganic solar cells can benefit from the solution processing and from the broad spectral absorption range of semiconductor nanocrystals. We have studied hybrid bulk heterojunctions between Silicon nanocrystals (Si-nc), which have been synthesized by decomposition of silane in a microwave plasma reactor, and the organic hole conductor poly(3-hexylthiophene-2,5-diyl) (P3HT). Hybrid bulk heterojunction solar cells with P3HT and Si-nc have been produced and characterized by current-voltage measurements. For these devices, we have demonstrated by spectrally resolved photocurrent measurements that both components of the solar cell, the Si-nc and the P3HT, contribute to the photocurrent. Current-voltage measurements under white light illumination with 100 mW/cm² show a high open circuit voltage of up to 0.7 V.