Morphology control via dual solvent crystallization for high-mobility functionalized pentacene-blend thin film transistors

作者：Lada Maria^*; Starink Marco J; Carrasco Miguel; Chen Lichun; Miskiewicz Pawel; Brookes Paul; Obarowska Margaret; Smith David C

来源：Journal of Materials Chemistry, 2011, 21(30): 11232-11238.

DOI：10.1039/c1jm11119a

We present an approach to improving the performance of solution processed organic semiconductor transistors based on a dual solvent system. We here apply this to a blend containing the pi-conjugated small molecule 6,13 bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) and polystyrene, which acts as an inert binder. Using a semiconductor-binder solution of two solvents, where the main solvent is a better solvent of the small molecule and second solvent is a better solvent of the polymer, crystal morphologies can be altered and transistor mobilities increased by almost an order of magnitude. In this way, air-ambient and solution-processed transistors with linear and saturation mobilities higher than 1 cm(2) V(-1) s(-1) have been fabricated. We discuss how the solubility properties of the formulation components can be used to identify solvent candidates that promote an efficient self-assembly of the small molecule.

• 出版日期2011