Large-Dimensional Organic Semiconductor Crystals with Poly(butyl acrylate) Polymer for Solution-Processed Organic Thin F
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ORIGINAL ARTICLE - ELECTRONICS, MAGNETICS AND PHOTONICS
Large-Dimensional Organic Semiconductor Crystals with Poly(butyl acrylate) Polymer for Solution-Processed Organic Thin Film Transistors Yeqing Sun1 · Ziyang Zhang2 · Kyeiwaa Asare‑Yeboah3 · Sheng Bi1 · Zhengran He4 Received: 30 July 2020 / Accepted: 2 October 2020 © The Korean Institute of Metals and Materials 2020
Abstract Despite solution processed organic semiconductors have attracted much research attention, the randomized crystallization and large prevalence of grain boundary remain as a challenge to realize high performance organic electronic applications. In this work, we report the incorporation of poly(butyl acrylate) polymer additive with organic semiconductors with the mediation of a solvent vapor annealing method in order to modify the nucleation and crystal growth process. As 6,13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) was experimented as a benchmark semiconductor, we demonstrated that the TIPS pentacene/poly(butyl acrylate) mixture exhibits rigidly aligned crystals, large grain width and improved areal coverage. In particular, thin film morphological characterization indicated a substantial reduction in misorientation angle by approximately two orders of magnitude as well as a 5-fold enlargement of grain width. A grain boundary model is proposed as a theoretic basis to understand the connection between grain width and hole mobility. Bottom-gate, top-contact thin film transistors based on TIPS pentacene/poly(butyl acrylate) blends demonstrated enhanced hole mobility of up to 0.11 cm2/Vs.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13391-020-00253-w) contains supplementary material, which is available to authorized users. * Sheng Bi [email protected] * Zhengran He [email protected] 1
Key Laboratory for Precision and Non‑traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China
2
Department of Electrical Engineering, Columbia University, New York City, NY 10027, USA
3
Department of Electrical and Computer Engineering, Penn State Behrend, Erie, PA 16563, USA
4
Department of Electrical and Computer Engineering, The University of Alabama, 35487 Tuscaloosa, AL, USA
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Vol.:(0123456789)
Electronic Materials Letters
Graphic Abstract
Keywords Poly(butyl acrylate) · TIPS pentacene · Crystal growth · Grain boundary · Organic thin film transistors · Organic electronics
1 Introductions Substantial progress has been recently achieved in the research of solution processed organic semiconductors, including major advances to the semiconductor solubility [1, 2], charge transport [3–5] and environmental stability [6, 7]. High performance organic electronic devices including thin film transistors [8–13], photodetectors [14, 15], light emitting diodes [16, 17] and sensors [18–20] have thereby been successfully fabricated by implementing various organic semiconductors, such as 6,13-bis(tr iisopr
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