Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 3: Electronic Structure and Transport Properties

SYOH 3.1: Vortrag

Donnerstag, 11. März 2004, 16:00–16:15, H37

Electronic transport in tetracene single crystals: A benchmark for thin film devices — •J. Pflaum, J. Niemax, A.K. Tripathi, Chr. Herb, and Chr. Ender — 3. Phys. Inst., Universität Stuttgart, 70550 Stuttgart

Although a major contribution in the field of molecular electronics is attributed to organic thin film devices, the intrinsic electronic properties of organic materials without the influence of structural disorder or contact effects can be studied only for single crystals. We have carried out transport studies on tetracene single crystals prepared by different growth techniques in combination with chemical analysis by gas chromatography. Comparing the charge carrier transport, different temperature dependences of the hole mobility together with different mobility values at room temperature (RT) were observed. For crystals grown by a modified Bridgman setup the hole mobility of ∼ 0.1cm²/Vs at RT is much smaller than that of ∼ 1cm²/Vs obtained for crystals grown by sublimation in an H₂ vapor stream. The result can be explained by different concentrations and energies of the occurring traps related to the respective preparation method. Supported by the DFG (OFET-Schwerpunktprogramm).