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

Maria Lada, Marco J. Starink, Miguel Carrasco, Lichun Chen, Pawel Miskiewicz, Paul Brookes, Margaret Obarowska, David C. Smith

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

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 π-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 cm2 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.

Original languageEnglish
Pages (from-to)11232-11238
Number of pages7
JournalJournal of Materials Chemistry
Volume21
Issue number30
DOIs
StatePublished - Aug 14 2011
Externally publishedYes

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