Orientation and mobility control of 4HCB organic film for flexible X-ray detectors with high performance  

作　　者：Meng Xu Menghua Zhu Dou Zhao Sixin Chen Shilin Liu Quanchao Zhang Pei Yuan Binbin Zhang Paul Sellin Wanqi Jie Yadong Xu 

机构地区：[1]State Key Laboratory of Solidification Processing,MIIT Key Laboratory of Radiation Detection Materials and Devices,and School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Department of Physics,University of Surrey,Guildford GU27XH,UK

出　　处：《Journal of Materials Science & Technology》2023年第4期46-53,共8页材料科学技术（英文版）

基　　金：This work was supported by the National Natural Science Foundations of China(Nos.U2032170,51872228,62104194 and 51802262);The project was also supported by the Fundamental Research Funds for the Central University(3102020QD0408 and D5000210906);the Natural Science Foundation of Shaanxi Province(2020JC-12);the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(No.2022-TS-07).

摘　　要：In comparison to inorganic counterparts,organic semiconducting(OSC)crystalline films are promising for building large-area and flexible ionizing radiation detectors for X-ray imaging or dosimetry due to their tissue equivalence,simple processing and large-scale production accessibility.Fabrication processes,how-ever,hinder the ability to generate aligned and large-area films with high carrier mobility.In this work,the space-confined melt process is used to produce highly orientated 4HCB(4-hydroxycyanobenzene)OSC films with a large area of 15×18 mm^(2).The out-of-plane direction of the 4HCB film is<001>,and the benzene rings are found to be extensively overlapped inside the in-plane direction,according to the XRD patterns.The film exhibits a high resistivity up to 1012cm,and high hole mobility of 10.62 cm^(2)V^(−1)s^(−1).Furthermore,the 4HCB(80μm-thick film)based X-ray detectors can achieve a sensitivity of 93μC Gy air^(−1) cm^(−2)and on/offratio of 157.The device also shows steady flexibility,with no degradation in detecting function after 100 cycles of bending.Finally,the proposed 4HCB film detectors demonstrated a high-resolution X-ray imaging capability.The imaging of several materials with sharp edges(copper and polytetrafluoroethylene)has been obtained.This work has developed a fast but efficient approach for producing large-area,highly oriented OSC films for high-performance X-ray detectors.

关 键 词：Organic semiconducting films Highly oriented X-ray Detector X-ray imaging Wearable detector 

分 类 号：TB383.2[一般工业技术—材料科学与工程]