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Publication Citation: Structure and Properties of Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors

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Author(s): Vivek M. Prabhu; Jihoon Kang; Nayool Shin; Do Y. Yoon; Do Y. Jang;
Title: Structure and Properties of Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors
Published: June 04, 2008
Abstract: A comprehensive structural and electrical characterization of solution-processed blend films of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) and poly(alpha-methylstyrene) (PaMS) was performed to understand and optimize the blend semiconductor films, which are very attractive as the active layer in organic thin-film transistors (OTFTs). Our study, based on careful measurements of specular neutron reflectivity and grazing-incidence X-ray diffraction, showed not only the important segregation phenomenon of TIPS-pentacene to the air surface but also a surprising effect of the molecular weight of the PaMS insulator on the TIPS-pentacene segregation and crystallization at the solid substrate, which is most critical to the charge transport in solution-processed OTFTs. This new finding led to the preparation of the TIPS-pentacene/PaMS blend active layer with superior functional properties over those of neat TIPS-pentacene, exhibiting high field-effect mobility, high on/off ratio and low threshold voltage.
Citation: Journal of the American Chemical Society
Volume: 130
Pages: pp. 12273 - 12275
Keywords: organic semiconductor; polymer thin film; neutron reflectivity;
Research Areas: NCNR, Synchrotron, Polymers, Electronics, Nanomaterials, Soft Condensed Matter
PDF version: PDF Document Click here to retrieve PDF version of paper (346KB)