Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.95: Poster

Monday, March 23, 2009, 14:30–17:00, P2

Deviations from the Einstein relation in organic semiconductors — •Vera Stehr¹, Carsten Deibel¹, and Vladimir Dyakonov^{1, 2} — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²Functional Materials for Energy Technology, Bavarian Centre for Applied Energy Research (ZAE Bayern), D-97074 Würzburg

During the last years, increasing attention is drawn to organic semiconductors, since they capture more and more fields of application (e. g. light emitting diodes, organic photovoltaics). It is known that the Einstein relation, which states that the ratio of the diffusion to the mobility equals the thermal voltage, does not hold for organic semiconductors with a gaussian density of states distribution. Deviations were observed in the case of high energetic disorder and low temperatures. We studied these deviations by means of Monte Carlo simulations, paying particular attention to the so far mostly neglected electric field. We discuss the relevance of our findings to the physical description of organic devices.