Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 31: Organic semiconductors

HL 31.10: Vortrag

Mittwoch, 29. März 2006, 17:00–17:15, POT 51

Charge modulation spectroscopy and electrical transport in single crystalline OFETs — •MATTHIAS FISCHER¹, BRUNO GOMPF¹, ASHUTOSH TRIPATHI², JENS PFLAUM², and MARTIN DRESSEL¹ — ¹1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart. — ²3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart.

Transport in organic thin films is limited by grain boundaries, traps and imperfections of the film morphology. To get access to the intrinsic properties of organic semiconductors, for example the maximum possible mobility, investigations on single crystals are essential. We have fabricated organic field effect transistors (OFETs) on sublimation grown high quality single crystals of rubrene, tetracene and anthracene. As gate insulator we use PPX. To avoid photoreaction at the surface all investigations were carried out under yellow light. In the case of rubrene these crystals show hole mobilities well above 1 cm²/Vs in surface space charge limited current and in FET measurements, respectively. Charge-modulation spectroscopy in the far- and mid infrared of the accumulation layer in the conductive channel gives additional information of the high frequency conduction and the physics of the charge transport in these presumably small bandwidth materials. Supported by the DFG through Go 642/6-1,2 and PF385/2.