Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 4: Organic Transistors
SYOE 4.4: Vortrag
Dienstag, 27. März 2007, 10:45–11:00, H1
Spatially-Resolved Photoresponse Measurements on Pentacene Thin-Film Transistors — Matthias Fiebig1, Christoph Erlen2, Paolo Lugli2, Udo Beierlein1, and •Bert Nickel1 — 1Dep. für Physik und CeNS, Ludwig-Maximilians-Universität, München — 2Institute for Nanoelectronics, Technische Universität München
Spatially resolved photoresponse has been measured on pentacene thin film transistors. The technique allows for the investigation of the response to illumination with a spatial resolution in the submicron regime. Enhanced photoresponse was observed close to the negatively biased electrode. We have modelled the experiment using drift-diffusion simulations and a photo doping mechanism. In this model holes in pentaene can drift, while electrons remain almost fixed at their site of generation until they recombine. The electron lifetime extracted from this model is in the order of 10 ps.