Vertical Conducting Nanodomains Self-Assembled from Poly(3-hexyl thiophene)-Based Diblock Copolymer Thin Films

Title
Vertical Conducting Nanodomains Self-Assembled from Poly(3-hexyl thiophene)-Based Diblock Copolymer Thin Films
Authors
이윤재김세훈양회창장미황승상이한섭백경열
Issue Date
2011-02
Publisher
The journal of physical chemistry. C, Nanomaterials and Interfaces
Citation
VOL 115, NO 10, 4228-4234
Abstract
We have synthesized π-conjugated poly(3-hexyl thiophene)-block-poly(methyl methacrylate) (P3HT-b-PMMA) with a P3HT molecular weight of 11 kDa and a PMMA volume fraction of 0.53, which potentially has several organic electronic applications. Its phase-separation behavior was investigated for various thicknesses cast from organic solvents. When cast onto 300 nm thick SiO2 dielectrics from toluene, in which the P3HT segments have limited solubility, the P3HT-b-PMMA films consist of nanofibrillar self-assemblies of laterally π-stacked P3HT chains. In contrast, the P3HT segments were found to be highly mobile in chlorobenzene, generating a typical phase-separation morphology consisting of vertically conducting P3HT nanodomains on these dielectrics. As the thickness of the cast films increased, however, the topmost surface becomes covered with π-conjugated nanofibrils that are laterally oriented with respect to the surface. Due to the anisotropic domain orientations of P3HT, top-gate organic fieldeffect transistors (OFETs) containing the P3HT-b-PMMA films exhibited enhanced electrical performance compared to bottomgate OFETs.
URI
http://pubs.kist.re.kr/handle/201004/39614
ISSN
1932-7447
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KIST Publication > Article
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