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


Lada, Maria, Starink, Marco J., Carrasco, Miguel, Chen, Lichun, Miskiewicz, Pawel, Brookes, Paul, Obarowska, Margaret and Smith, David C. (2011) Morphology control via dual solvent crystallization for high-mobility functionalized pentacene-blend thin film transistors. Journal of Materials Chemistry, 21, (30), 11232-11238. (doi:10.1039/C1JM11119A).

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Description/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.

Item Type: Article
Additional Information: We show how to achieve TIPS-pentacene-based transistors with record mobilities up to 1.8 cm2/Vs by exploiting differential solubility properties in a two solute, two solvent (i.e. quaternary) solution.
ISSNs: 0959-9428 (print)
1364-5501 (electronic)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 198217
Date Deposited: 03 Oct 2011 11:10
Last Modified: 27 Mar 2014 19:46
URI: http://eprints.soton.ac.uk/id/eprint/198217

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