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Issue 27, 2010
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Effect of pentacene–dielectric affinity on pentacene thin film growth morphology in organic field-effect transistors

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Abstract

Organic field-effect transistors (OFETs) are fabricated by depositing a thin film of semiconductor on the functionalized surface of a SiO2 dielectric. The chemical and morphological structures of the interface between the semiconductor and the functionalized dielectric are critical for OFET performance. We have characterized the effect of the affinity between semiconductor and functionalized dielectric on the properties of the semiconductor–dielectric interface. The crystalline microstructure/nanostructure of the pentacene semiconductor layers, grown on a dielectric substrate that had been functionalized with either poly(4-vinyl pyridine) or polystyrene (to control hydrophobicity), and grown under a series of substrate temperatures and deposition rates, were characterized by X-ray diffraction, photoemission spectroscopy, and atomic force microscopy. By comparing the morphological features of the semiconductor thin films with the device characteristics (field-effect mobility, threshold voltage, and hysteresis) of the OFET devices, the effect of affinity-driven properties on charge modulation, charge trapping, and charge carrier transport could be described.

Graphical abstract: Effect of pentacene–dielectric affinity on pentacene thin film growth morphology in organic field-effect transistors

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Article information


Submitted
15 Oct 2009
Accepted
19 Apr 2010
First published
07 Jun 2010

J. Mater. Chem., 2010,20, 5612-5620
Article type
Paper

Effect of pentacene–dielectric affinity on pentacene thin film growth morphology in organic field-effect transistors

S. H. Kim, M. Jang, H. Yang and C. E. Park, J. Mater. Chem., 2010, 20, 5612
DOI: 10.1039/B921371F

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