Ultra-low misorientation angle in small-molecule semiconductor/polyethylene oxide blends for organic thin film transistors

Zhengran He; Ziyang Zhang; Sheng Bi; Kyeiwaa Asare-Yeboah; Jihua Chen

doi:10.1007/s10965-020-02047-y

Ultra-low misorientation angle in small-molecule semiconductor/polyethylene oxide blends for organic thin film transistors

Zhengran He, Ziyang Zhang, Sheng Bi, Kyeiwaa Asare-Yeboah, Jihua Chen

Macromolecular Nanomaterials

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

In this work, we report for the first time the use of a nonconjugated semicrystalline polymer as a film-forming agent to control the crystallization and tune the charge transport of solution-processed, small-molecule organic semiconductors. When 6,13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) was demonstrated as a representative material to blend with polyethylene oxide (PEO) polymer, it crystallized into uniformly-aligned needles with reduced random orientation, enhanced long-range order and elevated areal coverage. Specifically, an ultra-low misorientation angle of 7.9° ± 3.5° was obtained with 10% PEO additive, beneficial for charge transport in the TIPS pentacene/PEO hybrid film. Bottom-gate, top-contact organic thin film transistors (OTFTs) based on TIPS pentacene/PEO mixture were found to show a field-effect mobility up to 2.5 × 10⁻² cm²/Vs. This work may be universally applied to other organic semiconductors to regulate their crystal formation, enhance film forming and improve device performance of OTFTs. It contributes to the utilization of flexible substrates for future-generation high-performance organic electronics.

Original language	English
Article number	75
Journal	Journal of Polymer Research
Volume	27
Issue number	3
DOIs	https://doi.org/10.1007/s10965-020-02047-y
State	Published - Mar 1 2020

Funding

Z. H. would like to acknowledge support provided from the University of Alabama. S. Bi would like to thank Science and Technology Project of Liaoning Province (20180540006). A part of this research was conducted at the Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, which is a DOE Office of Science User Facility. Z. H. would like to acknowledge support provided from the University of Alabama. S. Bi would like to thank Science and Technology Project of Liaoning Province (20180540006). A part of this research was conducted at the Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, which is a DOE Office of Science User Facility.

Funders	Funder number
DOE Office of Science
Oak Ridge National Laboratory
University of Alabama
Department of Science and Technology of Liaoning Province	20180540006

Keywords

Crystal orientation
Mobility
Organic thin film transistors
Polymer additive
Small-molecule semiconductor

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10.1007/s10965-020-02047-y

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abstract = "In this work, we report for the first time the use of a nonconjugated semicrystalline polymer as a film-forming agent to control the crystallization and tune the charge transport of solution-processed, small-molecule organic semiconductors. When 6,13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) was demonstrated as a representative material to blend with polyethylene oxide (PEO) polymer, it crystallized into uniformly-aligned needles with reduced random orientation, enhanced long-range order and elevated areal coverage. Specifically, an ultra-low misorientation angle of 7.9° ± 3.5° was obtained with 10% PEO additive, beneficial for charge transport in the TIPS pentacene/PEO hybrid film. Bottom-gate, top-contact organic thin film transistors (OTFTs) based on TIPS pentacene/PEO mixture were found to show a field-effect mobility up to 2.5 × 10−2 cm2/Vs. This work may be universally applied to other organic semiconductors to regulate their crystal formation, enhance film forming and improve device performance of OTFTs. It contributes to the utilization of flexible substrates for future-generation high-performance organic electronics.",

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Ultra-low misorientation angle in small-molecule semiconductor/polyethylene oxide blends for organic thin film transistors

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