Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 4: Organic Transistors

SYOE 4.4: Talk

Tuesday, March 27, 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.