Cocrystal engineering:towards high-performance near-infrared organic phototransistors based on donor-acceptor charge transfer cocrystals  

作　　者：Fei Li Lei Zheng Yajing Sun Shuyu Li Lingjie Sun Fangxu Yang Weibing Dong Xiaotao Zhang Wenping Hu 

机构地区：[1]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Institute of Molecular Aggregation Science of Tianjin University,Tianjin 300072,China [2]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,School of Science,Tianjin University,Tianjin 300072,China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China [4]Key Laboratory of Resource Chemistry and Eco-environmental Protection in Qinghai-Tibet Plateau,Qinghai Minzu University,Xining 810007,China

出　　处：《Science China Chemistry》2023年第1期266-272,共7页中国科学（化学英文版）

基　　金：supported by the Ministry of Science and Technology of China(2018YFA0703200 and 2017YFA0204503);the National Natural Science Foundation of China(52121002,51733004,U21A6002,51725304 and 21875158);Tianjin Natural Science Foundation(20JCJQJC00300);China Postdoctoral Science Foundation(2021M692381)。

摘　　要：Near-infrared organic phototransistors have wide application prospects in many fields.The active materials with the high mobility and near-infrared response are critical to building high-performance near-infrared organic phototransistors,which are scarce at present.Herein,a new charge transfer cocrystal using 5,7-dihydroindolo[2,3-b]carbazole(5,7-ICZ)as the donor and 2,2’-(benzo[1,2-b:4,5-b’]dithiophene-4,8-diylidene)dimalononitrile(DTTCNQ)as the acceptor is properly designed and prepared in a stoichiometric ratio(D:A=1:1),which not only displays a high electron mobility of 0.15 cm^(2)V^(-1)s^(-1) and very low dark current,but also can serve as the active layer materials in the region of near-infrared detection due to the narrowed band gap and good charge transport properties.A high photosensitivity of 1.8×10^(4),the ultrahigh photoresponsivity of 2,923 A W-1and the high detectivity of 4.26×10^(11)Jones of the organic near-infrared phototransistors are obtained.

关 键 词：organic semiconductors charge transporting properties organic cocrystals organic field effect transistors near-infrared organic phototransistors 

分 类 号：O641.1[理学—物理化学]