Evaluation of molecular orientation and alignment of poly(3-hexylthiophene) on Au (111) and on poly(4-vinylphenol) surfaces

The orientation and alignment of regioregular poly(3-hexylthiophene) (P3HT) molecules on Au (111) surface and on poly(4-vinylphenol) (PVP) thin film were investigated. The P3HT molecules on the smooth Au (111) are oriented with both the backbones and the side chains parallel to the substrate (plane-...

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Bibliographic Details
Published in:Thin solid films 2008-03, Vol.516 (9), p.2695-2699
Main Authors: Yamamoto, Koji, Ochiai, Shizuyasu, Wang, Xin, Uchida, Yoshiyuki, Kojima, Kenzo, Ohashi, Asao, Mizutani, Teruyoshi
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Electronics
Exact sciences and technology
Molecular orientation
OFET
P3HT
Physics
PVP
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Structure and morphology
thickness
Surface modification
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
Transistors
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Summary:The orientation and alignment of regioregular poly(3-hexylthiophene) (P3HT) molecules on Au (111) surface and on poly(4-vinylphenol) (PVP) thin film were investigated. The P3HT molecules on the smooth Au (111) are oriented with both the backbones and the side chains parallel to the substrate (plane-on orientation) as revealed by the scanning tunneling microscope (STM) images. However, the P3HT molecules on the PVP thin films are preferably oriented with side chains perpendicular to the surface (edge-on orientation). Surface modification of the PVP by hexamethyldisilazane (HMDS) can increase the crystalline size in the P3HT semicrystalline films. The performance of an all-polymer organic field-effect transistor (OFET) with the drop-cast P3HT semiconductor layer and the crosslinked PVP gate insulator on poly(ethylene naphthalate) (PEN) substrate was evaluated.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2007.04.145