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

doi:10.1016/j.jmst.2022.06.045

J. Mater. Sci. Technol. ›› 2023, Vol. 135: 46-53.DOI: 10.1016/j.jmst.2022.06.045

• Research Article • Previous Articles Next Articles

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

Meng Xu^a, Menghua Zhu^a,*, Dou Zhao^a, Sixin Chen^a, Shilin Liu^a, Quanchao Zhang^a, Pei Yuan^a, Binbin Zhang^a, Paul Sellin^b, Wanqi Jie^a, Yadong Xu^a,*

^aState 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;
^bDepartment of Physics, University of Surrey, Guildford GU2 7XH, UK

Received:2022-02-18 Revised:2022-06-02 Accepted:2022-06-25 Published:2023-02-01 Online:2022-08-02
Contact: *E-mail addresses: mhzhu@nwpu.edu.cn (M. Zhu), xyd220@nwpu.edu.cn (Y. Xu)

Abstract

Abstract: 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, however, 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 mm². 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 10¹²Ω cm, and high hole mobility of 10.62 cm² 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/off ratio 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.

Key words: Organic semiconducting films, Highly oriented, X-ray Detector, X-ray imaging, Wearable detector

Meng Xu, Menghua Zhu, Dou Zhao, Sixin Chen, Shilin Liu, Quanchao Zhang, Pei Yuan, Binbin Zhang, Paul Sellin, Wanqi Jie, Yadong Xu. Orientation and mobility control of 4HCB organic film for flexible X-ray detectors with high performance[J]. J. Mater. Sci. Technol., 2023, 135: 46-53.

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

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