Organic TFT with rubbing organic layer

　 We have investigated organic thin-film transistors (OTFTs) with a bilayer of rubbed and evaporated hydrocarbon-based acene 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) as an active layer. Using a rubbing process after spin-coating the C8-BTBT, crystallinity of the C8-BTBT thin film was improved and resultant superior OTFT characteristics were realized. We obtained a field-effect mobility of 1.6 cm2/Vs, a threshold voltage of -8.2 V, an on-off ratio of 10^6, and a subthreshold swing of 55 mV/decade.

S. Funada, S. Shaari, S. Naka, and H. Okada, “Organic Thin-Film Transistors with Bilayer of Rubbed and Evaporated Hydrocarbon-based Acene as Active Layer”, Mat. Sci. Semiconduct. Processing, 60, 1-4 (2017) doi.org10.1016j.mssp.2016.12.020.