Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.78: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

Investigation of electronic traps in organic transport layers via thermally stimulated current measurements — •Julia Schafferhans¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Div. Functional Materials for Energy Technology, ZAE Bayern e.V., Am Hubland, 97074 Würzburg, Germany

Charge transport in disordered organic semiconductors is generally described as thermally activated hopping in a gaussian distribution of localized states. The presence of charge traps is critical to the performance of organic electronic devices, since trapped charge carriers do no longer contribute to current flow. We investigate the depth and the density of trap states in the polymer poly(3-hexylthiophene) (P3HT) by applying the thermally stimulated current (TSC) technique. In particular, we present experimental data on the influence of doping the polymer with fullerene derivatives, which are relevant for the application in organic photovoltaics.