Ultrathin organic films for field effect transistors

Henrik G. O. Sandberg; Oliver Henze; Henning Sirringhaus; Andreas Kilbinger; W. James Feast; Richard H. Friend

doi:10.1117/12.451476

21 December 2001 Ultrathin organic films for field effect transistors

Henrik G. O. Sandberg, Oliver Henze, Henning Sirringhaus, Andreas Kilbinger, W. James Feast, Richard H. Friend

Proceedings Volume 4466, Organic Field Effect Transistors; (2001) https://doi.org/10.1117/12.451476
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Organic field effect transistors FET have been fabricated with active semiconducting organic thin films that are only a few monolayers thick. The motivation of this study has been to establish a direct correlation between transistor performance and the polymer microstructure in the ultrathin accumulation layer of the transistor. Monolayer thick films of a block copolymer and several model oligomers consisting of a rigid conjugated sexithiophene (6T) block and a flexible polyethyleneoxide (PEO) block have been deposited onto the surface of e.g. SiO₂ gate dielectrics functionalized with a self-assembled monolayer. Block copolymer phase behavior and surface morphology has been studied as a function of chain length, solvent and film thickness. Operational transistors have been demonstrated with film thicknesses of only one or two monolayers. Typical device characteristics show a carrier mobility on the order of 10^-2 - 10^-3 cm²/Vs and ON-OFF current ratio of 10³ - 10⁵. Film microstructure, orientation of micro-crystallites and film thickness have been studied by atomic force microscopy (AFM), UV-Vis absorption spectroscopy and X-ray diffraction.

Citation Download Citation

Henrik G. O. Sandberg, Oliver Henze, Henning Sirringhaus, Andreas Kilbinger, W. James Feast, and Richard H. Friend "Ultrathin organic films for field effect transistors", Proc. SPIE 4466, Organic Field Effect Transistors, (21 December 2001); https://doi.org/10.1117/12.451476

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