Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.81: Poster

Tuesday, March 27, 2007, 18:00–20:00, Poster B

Investigation of the non-linearity in Output Characteristics of Organic Field-Effect Transistors — •Andrei Herasimovich, Susanne Scheinert, and Ingo Hörselmann — TU Ilmenau, PF, 98684 Ilmenau, Germany

Organic field effect transistors (OFETs) have shown a promising potential for applications as active matrix displays and RFID. For such applications they must have good electrical characteristics, which not always can be reached. For instance, a nonlinearity takes place in output characteristics of OFETs at the small drain/source voltages. This non linearity was attributed in literature to contact problems or field dependent mobility [1,2].

We have prepared OFETs in top contact (TOC) and bottom contact (BOC) design with channel lengths more than 25μm. The measured output characteristics show only a nonlinearity for the TOC-transistors. From our 2D-simulations result, the field dependence of the mobility is not the reason for such long channel devices. However, bulk traps in the polymer layer can cause the nonlinearity in the TOC-structure whereas in the BOC design only the drain current is strongly reduced.

[1] D.J. Gundlach, L. Zhou, J.A. Nichols, T.N. Jackson, P.V. Necliudov, M.S. Shur, J. Appl. Phys. 100, 024509 (2006).

[2] S. Cherian, C. Donley, D. Mathine, L. LaRussa, W. Xia, N. Armstrong, J. Appl. Phys. 96, 5638 (2004).