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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology



Thursday, 04 February 2016
(at 13:00 in room 115, Hallwachsstr. 3)
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Charge-transfer states for organic solar cells and NIR photo-detectors

Prof. Koen Vandewal


Institut für Angewandte Photophysik (IAPP), TU Dresden, Germany
   






Organic solar cells based on interfaces between electron donor and electron acceptor molecules have incident-photon-to-extracted-charge conversion yields of over 85%, and absorbed photon-to-extracted-charge conversion yields of 90-100%. Their power conversion efficiency is currently limited by their low operating voltage, as compared to the optical gap of the main absorber material, indicating large energy losses per absorbed photon. We explore possibilities for increasing the operating voltage and discuss the influence of the donor-acceptor interfacial area, electronic coupling and molecular reorganization. Charge transfer (CT) states at the donor-acceptor interface play hereby an important role. These states have interesting fundamental properties which will be exploited to enable narrow band, near-IR photo-detection. This new type of photodetector competes in the near-infrared (NIR) wavelength range with standard organic photodetectors but extends their detection range to longer wavelengths.

Announcement (pdf)


Brief Bio:

Koen Vandewal received his MSc in photonics engineering from Ghent University (Belgium) in 2004 and his PhD in Physics from Hasselt University (Belgium) in 2009. Subsequently, he spent 2 years as a postdoctoral researcher in the Biomolecular and Organic Electronics group at Linkoping University (Sweden), followed by a 2 year postdoc at Stanford University (USA), investigating charge carrier generation and recombination processes in organic optoelectronic devices. Since 2014 he holds the endowed chair for Organic Photovoltaics at the Institut für Angewandte Photophysik (IAPP) of the Technische Universität Dresden (Germany).

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2018.10.24 Mi
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