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 April 19, 2024)
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Structure and Properties of Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors
Published
Author(s)
, 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
Download Paper
Keywords
organic semiconductor, polymer thin film, neutron reflectivity
Citation
Created June 4, 2008, Updated February 19, 2017