Solution-processed organic thin-film transistors with verticalnanophase separation

We have found that spin coating a solution of 6,13-bis(triisopropyl-silylethynyl)-pentacene (TIPS-pentacene) blended with poly( α -methylstyrene) ( P α MS ) induces vertical nanophase separation, which results in a trilayer film: a TIPS-pentacene layer, a mixed layer of TIPS-pentacene/ P α MS , and a TIPS-pentacene layer. Organic thin-film transistors (TFTs) made from this TIPS-pentacene/ P α MS solution have remarkably improved uniformity and thermal stability without degradation of electrical characteristics compared to organic TFTs with a conventional TIPS-pentacene sole channel layer.