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

Published

June 4, 2008

Author(s)

Vivek M. Prabhu, Jihoon Kang, Nayool Shin, Do Y. Yoon, Do Y. Jang

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

Pub Type

Journals

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Keywords

organic semiconductor, polymer thin film, neutron reflectivity

Citation

Prabhu, V. , Kang, J. , Shin, N. , Yoon, D. and Jang, D. (2008), Structure and Properties of Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors, Journal of the American Chemical Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=854087 (Accessed December 13, 2024)