Berlin 2005 – scientific programme
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.22: Poster
Monday, March 7, 2005, 18:00–20:00, Poster TU A
New materials for fully polymer bulk heterojunction solar cells — •Martin Knipper1, Michael Pientka1, Vladimir Dyakonov1, Jürgen Parisi1, Silvia Janietz2, Bert Fischer2, and Hartmut Krüger2 — 1Energy and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg, 26111 Oldenburg — 2Fraunhofer Institute Applied Polymer Research, Potsdam, Germany
Photoinduced electron transfer in composites of conjugated polymer poly-[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenvinylen and poly(3-hexylthiophene) blended with copolyquinoxalines, materials with n-type semiconducting properties and low reduction peak potentials, is studied by means of photoluminescence, light-induced electron spin resonance, as well as quasi steady-state photoinduced absorption spectroscopy. The quenching of photoluminescence, the occurrence of two new optical absorption bands, and the formation of light-induced paramagnetic species on the polymer chain are altogether interpreted as an electron transfer between donor polymer and acceptor copolyquinoxalines in the excited state. Polymer/polymer photovoltaic devices are prepared from such blends as active single layers. The electrical parameters of the devices are determined and discussed. in terms of the mobility and blend morphology.