Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 3: Organic Optoelectronics and Photonics I

SYOO 3.3: Hauptvortrag

Montag, 7. März 2005, 15:30–16:15, TU HE101

Organic Single-crystal Field-Effect Transistors — •Alberto Morpurgo — Kavli Institute of Nanoscience, Delft University, Netherlands

During the past two years different research groups have succeeded in fabricating field effect transistors (FETs) on organic single crystals of many different molecules. The unprecedented purity and reproducibility of these devices is enabling now the study of the intrinsic electronic transport properties of organic semiconductors as a function of charge density. In addition, beside the fundamental questions, the high device reproducibility enables to address technologically relevant issues related to elemental aspects of the devices and their influence on the device performance. After an explanation of the technological progress that has made this work possible, I will present an overview of the results that have been obtained so far. These include: 1) the achievement of unprecedented values of mobility (30 cm²/Vs), 2) the observation of anisotropic transport characteristics as a function of the crystal orientation, 3) a metallic-like temperature dependence of the mobility, 4) the first direct demonstration of the polaronic nature of charge carriers in organic semiconductors, and 5) the successful operation of organic single crystal FETs in the high density regime, where the effect of Coulomb interaction cannot be neglected. I will conclude by summarizing the present status of this research area and by illustrating prospects for upcoming work.