Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides  

作　　者：Jaeyong Ahn Zhenping Li Zhiwei Wang Ke Gao Huagui Zhuo Wanuk Choi Gang Chang Xiaobo Shang Joon Hak Oh 

机构地区：[1]School of Chemical and Biological Engineering,Institute of Chemical Processes,Seoul National University,Seoul 08826,South Korea [2]State Key Laboratory for Mechanical Behavior of Materials,Shaanxi International Research Center for Soft Matter,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]Center for Ordered Nanoporous Materials Synthesis,School of Environmental Science and Engineering,Pohang University of Science and Technology,Gyeongbuk 37673,South Korea [4]Instrumental Analysis Center of Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Chinese Chemical Letters》2024年第9期193-197,共5页中国化学快报（英文版）

基　　金：supported by the National Research Foundation(NRF)of Korea(Nos.2023R1A2C3007715,2021R1A4A1032515,RS-2023-00281944);funded by the Ministry of Science and ICT(MSIT)of Korea;Korea Toray Science Foundation,Shaanxi Fundamental Science Research Project for Chemistry&Biology(No.22JHQ035);Natural Science Basic Research Program of Shaanxi Province(No.2024JC-YBMS-081)。

摘　　要：Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free nature.However,the development of n-type semiconductors has lagged behind p-type semiconductors.To enhance semiconductor device performance,a doping process can be employed,which typically involves the introduction of charged impurities into the crystalline semiconducting material.Its aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ultimately enhancing the electrical properties of the material.Traditional doping processes,however,often pose a risk of damaging the structure of single crystals.In this study,we have synthesized novel cyanosubstituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor devices.We have employed a surface doping strategy using diethylamine vapor without disrupting the crystal structure.The fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm^(2)V^(-1)s^(-1),representing an improvement of over threefold.Furthermore,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response time.These results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs.

关 键 词：Doping effect PHOTOTRANSISTORS Perylene diimides Organic crystals Cyano substitution 

分 类 号：TN304[电子电信—物理电子学] TN386