Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanotechnology
Volume 2011 (2011), Article ID 914510, 6 pages
http://dx.doi.org/10.1155/2011/914510
Research Article

Effect of Processing Parameters on Performance of Spray-Deposited Organic Thin-Film Transistors

1Department of Physics, Wake Forest University, Winston-Salem, NC 27109, USA
2Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
3Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193-Barcelona, Spain

Received 1 February 2011; Accepted 14 March 2011

Academic Editor: Marisol Reyes-Reyes

Copyright © 2011 Jack W. Owen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The performance of organic thin-film transistors (OTFTs) is often strongly dependent on the fabrication procedure. In this study, we fabricate OTFTs of soluble small-molecule organic semiconductors by spray-deposition and explore the effect of processing parameters on film morphology and device mobility. In particular, we report on the effect of the nature of solvent, the pressure of the carrier gas used in deposition, and the spraying distance. We investigate the surface morphology using scanning force microscopy and show that the molecules pack along the π-stacking direction, which is the preferred charge transport direction. Our results demonstrate that we can tune the field-effect mobility of spray-deposited devices two orders of magnitude, from 10−3 cm2/Vs to 10−1 cm2/Vs, by controlling fabrication parameters.