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Research Article

Controlled 2D growth of organic semiconductor crystals by suppressing "coffee-ring" effect

Wei Wang1,§, Bei Lu1,§, Wei Deng1, Xiujuan Zhang1( ), Zhengjun Lu1, Di Wu2, Jiansheng Jie1( ), Xiaohong Zhang1
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China

§ Wei Wang and Bei Lu contributed equally to this work.

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Graphical Abstract

Abstract

Owing to enhanced charge transport efficiency arising from the ultrathin nature, two-dimensional (2D) organic semiconductor single crystals (OSSCs) are emerging as a fascinating platform for high-performance organic field-effect transistors (OFETs). However, "coffee-ring" effect induced by an evaporation-induced convective flow near the contact line hinders the large-area growth of 2D OSSCs through a solution process. Here, we develop a new strategy of suppressing the "coffee-ring" effect by using an organic semiconductor: polymer blend solution. With the high-viscosity polymer in the organic solution, the evaporation-induced flow is remarkably weakened, ensuring the uniform molecule spreading for the 2D growth of the OSSCs. As an example, wafer-scale growth of crystalline film consisting of few-layered 2,7-didecylbenzothienobenzothiophene (C10-BTBT) crystals was successfully accomplished via blade coating. OFETs based on the crystalline film exhibited a maximum hole mobility up to 12.6 cm2·V-1·s-1, along with an average hole mobility as high as 8.2 cm2·V-1·s-1. Our work provides a promising strategy for the large-area growth of 2D OSSCs toward high-performance organic electronics.

Keywords

two-dimensional (2D) organic semiconductor single crystalstwo-dimensional (2D) growth modecoffee-ring effectorganic field-effect transistors

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Nano Research
Volume 13 Issue 9,
September 2020
Pages 2478-2484
DOI: 10.1007/s12274-020-2882-x
Cite this article:
Wang W, Lu B, Deng W, et al. Controlled 2D growth of organic semiconductor crystals by suppressing "coffee-ring" effect. Nano Research, 2020, 13(9): 2478-2484. https://doi.org/10.1007/s12274-020-2882-x
Topics:
Organic field effect transistorsOrganic semiconductor materials

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Received: 04 March 2020
Revised: 04 March 2020
Accepted: 17 May 2020
Published: 02 July 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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