Solution-Processed Ambipolar Organic Thin-Film Transistors by Blending p- and n-Type Semiconductors: Solid Solution versus Microphase Separation
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AbstractHere, we report solid solution of p- and n-type organic semiconductors as a new type of p-n blend for solution-processed ambipolar organic thin film transistors (OTFTs). This study compares the solid-solution films of silylethynylated tetraazapentacene 1 (acceptor) and silylethynylated pentacene 2 (donor) with the microphase-separated films of 1 and 3, a heptagon-embedded analogue of 2. It is found that the solid solutions of (1)(0.5)(2)(1-x) function as ambipolar semiconductors, whose hole and electron mobilities are tunable by varying the ratio of 1 and 2 in the solid solution. The OTFTs of (1)(0.5)(2)(0.5) exhibit relatively balanced hole and electron mobilities comparable to the highest values as reported for ambipolar OTFTs of stoichiometric donor acceptor cocrystals and microphase-separated p-n bulk heterojunctions. The solid solution of (1)(0.5)(2)(0.5) and the microphase-separated blend of 1:3 (0.5:0.5) in OTFTs exhibit different responses to light in terms of absorption and photoeffect of OTFTs because the donor and acceptor are mixed at molecular level with pi-pi stacking in the solid solution.
All Author(s) ListXu XM, Xiao T, Gu X, Yang XJ, Kershaw SV, Zhao N, Xu JB, Miao Q
Journal nameACS Applied Materials and Interfaces
Detailed descriptionvol. 7
Volume Number7
Issue Number51
Pages28019 - 28026
LanguagesEnglish-United Kingdom
Keywordsambipolar; microphase separation; organic semiconductors; organic thin film transistors; solid solution
Web of Science Subject CategoriesMaterials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Science & Technology - Other Topics

Last updated on 2020-25-11 at 00:20