Effect of molecular ordering in active layer on organic thin-film transistor performance

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Abstract

<jats:title>Abstract</jats:title> <jats:p>We investigate the effect of molecular ordering in the semiconductor of inverted staggered-type organic thin-film transistors (OTFTs) on device parameters. Molecular ordering is controlled by modifying the gate insulator with self-assembled monolayers and clarified by X-ray diffraction analysis. The reduction in the density of free carriers in a semiconductor with the alkyl-modified surface reduces off-current (<jats:italic>I</jats:italic> <jats:sub>OFF</jats:sub>) and increases contact resistance (<jats:italic>R</jats:italic> <jats:sub>C</jats:sub>). In contrast, <jats:italic>I</jats:italic> <jats:sub>OFF</jats:sub> increases and <jats:italic>R</jats:italic> <jats:sub>C</jats:sub> decreases for a phenyl-modified surface. Ultraviolet photoemission studies revealed that differences in the molecular ordering and the surface dipole moment caused by the insulator surfaces are crucial for device parameters for OTFTs.</jats:p>

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