When 9:00 AM - 10:30 AM Oct 24, 2008
Where 1670 CSE
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Intrinsic Charge Carrier Transport and Optical Properties of Single-Crystal Organic Field-Effect Transistors.

Vitaly Podzorov, Rutgers University

Organic field-effect transistors (OFETs) represent essential building blocks of organic electronics. Despite the rapid progress of applied research in this area, our understanding of fundamental aspects of charge carrier transport in organic semiconductors is still limited. Recently developed single-crystal OFETs (see, e.g. [1,2]) allow studies of charge transport and optical properties of organic semiconductors that are not dominated by disorder. Owing to a great reproducibility and a very low density of defects in these devices, experimental observation of a band-like polaronic transport [3,4], Hall effect [5] and novel photo-induced phenomena [6,7,8] became possible in OFETs. Availability of well characterized single-crystal devices opens new exciting opportunities for research on charge carrier transport, photo-voltaic effect, sensing applications and nanoscale surface patterning of organic semiconductors. Recent developments will be discussed after an introduction.
1. R. W. I. de Boer, A. F. Morpurgo, M. E. Gershenson, V. Podzorov, Phys. Stat. Sol. (a) 201, 1302 (2004);
2. M. E. Gershenson, V. Podzorov, and A. F. Morpurgo, Rev. Mod. Phys. 78, 973 (2006);
3. V. Podzorov et al., Phys. Rev. Lett. 93, 086602 (2004);
4. V. C. Sundar et al., Science 303, 1644 (2004);
5. V. Podzorov et al., Phys. Rev. Lett. 95, 226601 (2005);
6. V. Podzorov et al., Phys. Rev. Lett. 95, 016602 (2005);
7. H. Najafov et al., Phys. Rev. Lett. 96, 056604 (2006);
8. M. F. Calhoun, C. Hsieh and V. Podzorov, Phys. Rev. Lett. 98, 096402 (2007).

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