@article{Wang2020, 
author = {Wei Wang and Bei Lu and Wei Deng and Xiujuan Zhang and Zhengjun Lu and Di Wu and Jiansheng Jie and Xiaohong Zhang},
title = {Controlled 2D growth of organic semiconductor crystals by suppressing "coffee-ring" effect},
year = {2020},
journal = {Nano Research},
volume = {13},
number = {9},
pages = {2478-2484},
keywords = {two-dimensional (2D) organic semiconductor single crystals, two-dimensional (2D) growth mode, coffee-ring effect, organic field-effect transistors},
url = {https://www.sciopen.com/article/10.1007/s12274-020-2882-x},
doi = {10.1007/s12274-020-2882-x},
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.}
}