Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 61: Organische Halbleiter

HL 61.1: Talk

Wednesday, March 9, 2005, 10:45–11:00, TU P270

Photoresponse of conjugated polymer/fullerene based Organic Field-Effect Transistors — •Nenad Marjanović, Birendra Singh, Serap Günes, Helmut Neugebauer, and Niyazi Serdar Sariciftci — Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Austria

Results on photoresponsive organic field-effect transistors (photOFETs) fabricated on ITO glass substrates using conjugated polymer/fullerene bulk heterojunction and bilayer concepts will be presented. Measurements in the dark with LiF/Al source and drain top contacts show dominantly n-type transistor behaviour. Under AM1.5 illumination, an increase in drain-source current Ids by five orders of magnitude is observed, whereas Ids becomes independent on the gate voltage. The results suggest that a photodoping effect (creation of a large free carrier concentration from a photoinduced charge transfer at the conjugated polymer/fullerene heterojunction upon illumination) is strongly dominating over the gate effect.