Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.30: Poster
Montag, 14. März 2011, 17:30–19:30, P2
Infrared absorbing materials for organic solar cells — •Matthias Holzschuh1, Toni Müller1,3, Roland Gresser1, Jan Meiss1, Günter Schnurpfeil2, Dieter Wöhrle2, Markus Hummert1, Karl Leo1, and Moritz Riede1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, 01069 Dresden, Germany — 2Institute of Organic and Macromolecular Chemistry, University of Bremen, 28334 Bremen, Germany — 3now at Heliatek GmbH, Treidlerstrasse 3, 01139 Dresden, Germany
A contribution to the future power supply in the days of global warming and enhanced CO2 emission might be the organic solar cells (OSC) as they provide a cost-efficient way to convert sunlight into electrical power. One way to improve OSC performance is to extend the absorption from the visible region of the solar spectrum (which can be harvested with current materials) into the infrared, a spectral region which is hardly used at the moment.
We incorporate a series of modified tin-phthalocyanines and different benz-annulated aza-bodipys as donor molecules into vacuum deposited SM-OSC, showing a thin film absorption above 700nm. We test different device configurations with C60 as acceptor. To gain understanding of the structure-property relationships, we additionally investigate molecular donor layers using AFM and SEM, and we study the influence of substrate heating during evaporation. Despite low open circuit voltages of about 0.4 V, we believe that the materials may be good candidates for tandem devices with complementary absorption to enhance efficiency.