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

作　　者：Wei Wang Bei Lu Wei Deng Xiujuan Zhang Zhengjun Lu Di Wu Jiansheng Jie Xiaohong Zhang 

机构地区：[1]Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,China [2]Key Laboratory of Materials Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Nano Research》2020年第9期2478-2484,共7页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.51973147,61904117,51821002 and 51672180);the Natural Science Foundation of Jiangsu Province of China(No.BK20180845);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),the 111 Project,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices;The authors thank the Collaborative Innovation Center of Suzhou Nano Science and Technology(Nano-CIC),Soochow University and Beamline BLI4B1(Shanghai Synchrotron Radiation Facility)for providing beam time.

摘　　要：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,ucoffee-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 cm^2·V^-1·s^-1,along with an average hole mobility as high as 8.2 cm^2·V^-1·s^-1.Our work provides a promising strategy for the large-area growth of 2D OSSCs toward high-performance organic electronics.

关 键 词：two-dimensional(2D)organic semiconductor single crystals two-dimensional(2D)growth mode coffee-ring effect organic field-effect transistors 

分 类 号：TN32[电子电信—物理电子学]