Highly efficient modulation of the electronic properties of organic semiconductors by surface doping with 2D molecular crystals  

作　　者：Yu Zhang Shuyuan Yang Xiaoting Zhu Fei Zhai Yiyu Feng Wei Feng Xiaotao Zhang Rongjin Li Wenping Hu 

机构地区：[1]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China [2]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China [3]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [4]Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China Chemistry》2020年第7期973-979,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (51873148, 61674116, 51633006);the Ministry of Science and Technology of China (2016YFA0202302);the Natural Science Foundation of Tianjin City (18JC-YBJC18400)。

摘　　要：Doping is a critically important strategy to modulate the properties of organic semiconductors(OSCs) to improve their optoelectrical performances. Conventional bulk doping involves the incorporation of foreign molecular species(i.e., dopants) into the lattice of the host OSCs, and thus disrupts the packing of the host OSCs and induces structural defects, which tends to reduce the mobility and(or) the on/off ratio in organic field-effect transistors(OFETs). In this article, we report a highly efficient and highly controllable surface doping strategy utilizing 2D molecular crystals(2DMCs) as dopants to boost the mobility and to modulate the threshold voltage of OFETs. The amount of dopants, i.e., the thickness of the 2DMCs, is controlled at monolayer precision, enabling fine tuning of the electrical properties of the OSCs at unprecedented accuracy. As a result, a prominent increase of the average mobility from 1.31 to 4.71 cm2 V-1 s-1 and a substantial reduction of the threshold voltage from -18.5 to -1.8 V are observed. Meanwhile, high on/off ratios of up to 108 are retained.

关 键 词：organic field-effect transistor organic single crystal 2D molecular crystal surface doping charge transport 

分 类 号：TN386[电子电信—物理电子学]