1. Field-effect transistors with organic semiconductor layers assembled from aqueous colloidal nano composites
- Author
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William Porzio, Ivano Bilotti, Fabio Biscarini, Massimiliano Cavallini, Silvia Destri, Chiara Dionigi, and Aldo Brillante, Pablo Stoliar, C. Dionigi, P. Stoliar, W. Porzio, S. Destri, M. Cavallini, I. Bilotti, A. Brillante, and F. Biscarini
- Subjects
ORGANIC SEMICONDUCTORS ,Materials science ,Nanotechnology ,Colloid ,chemistry.chemical_compound ,THIN FILMS ,Electrochemistry ,field effect transistors ,General Materials Science ,Thin film ,Spectroscopy ,Nanocomposite ,organic semiconductor ,business.industry ,H4T6 ,Surfaces and Interfaces ,Condensed Matter Physics ,equipment and supplies ,COLLOIDAL NANOCOMPOSITES ,Organic semiconductor ,Semiconductor ,polystyrene (PS) latex bead ,chemistry ,Chemical engineering ,Field-effect transistor ,Sublimation (phase transition) ,Polystyrene ,business - Abstract
We demonstrate field effect transistors based on organic semiconductor molecules dispersed in a self-organized polystyrene (PS) latex bead matrix. An aqueous colloidal composite made of PS and tetrahexylsexithiophene (H4T6) is deposited with a micropipet into the channel of a bottom-contact field effect transistor. The beads self-organize into a network whose characteristic distances are governed by their packing. The semiconductor molecules crystallize in the interstitial voids, leading to the growth of large interconnected domains. Depending on the bead size and the ratio between H4T6 and PS, the fraction of the different phases in the polymorph can be controlled. In the transistors where the H4T6 metastable "red phase" is the largest, the device response and the charge mobility are comparable to those of sexithienyl thin films grown by high-vacuum sublimation.
- Published
- 2007