Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 57: Organic Photovoltaics and Electronics II (joined session with CPP)

HL 57.2: Vortrag

Mittwoch, 22. März 2017, 15:00–15:15, POT 81

Novel Organic NIR Detector Class Based on Charge-Transfer Absorption — •Bernhard Siegmund, Andreas Mischok, Johannes Benduhn, Olaf Zeika, Sascha Ullbrich, Dhriti Ghosh, Frederik Nehm, Donato Spoltore, Hartmut Fröb, Christian Körner, Karl Leo, and Koen Vandewal — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, Dresden, Germany

Blending two organic species on a molecular level can introduce interfacial states which allow to absorb far below their optical gap. Although such intermolecular charge-transfer (CT) states form an important recombination path in organic solar cells, their near-infrared (NIR) absorption properties have been unused for photo-sensitive devices up to now. In this presentation, we disclose a new resonant optical cavity device architecture enabling NIR photodetection by means of efficient CT absorption. We demonstrate tunable detection wavelengths between 810nm and 1550nm with a single material blend, far below the optical gap of both donor and acceptor. The combination of spectral narrowband detection and broad tunability make this novel, flexible and potentially visibly transparent device principle highly suitable for integrated low cost spectroscopic NIR photodetection.