Melt-grown large-sized Cs2TeI6 crystals for X-ray detection

Bao Xiao; Fangbao Wang; Meng Xu; Xin Liu; Qihao Sun; Bin-Bin Zhang; Wanqi Jie; Paul Sellin; Yadong Xu

doi:10.1039/D0CE00868K

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Melt-grown large-sized Cs2TeI6 crystals for X-ray detection

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Melt-grown large-sized Cs2TeI6 crystals for X-ray detection

Bao Xiao, Fangbao Wang, Meng Xu, Xin Liu, Qihao Sun, Bin-Bin Zhang, Wanqi Jie, Paul Sellin and Yadong Xu

CrystEngComm, Vol.22(31), pp.5130-5136

10/08/2020

DOI: https://doi.org/10.1039/D0CE00868K

Abstract

Herein, we report the details of the synthesis and crystal growth of a lead-free perovskite derivative Cs2TeI6 crystal, which reveals long-term environmental stability. The synthesis process is optimized to obtain pure Cs2TeI6 polycrystals, and to eliminate the formation of residual CsI resulting from high vapor pressure. Subsequently, the Cs2TeI6 single crystal with dimensions of Φ10 mm × 55 mm is grown by the vertical Bridgman method. The as-grown 0-D structural Cs2TeI6 crystal exhibits a high resistivity of 9.92 × 1011 Ω cm, and resulting mobilities of 4.03 ± 0.33 cm2 V−1 s−1 and 9.40 ± 0.45 cm2 V−1 s−1 for electrons and holes, respectively. The Au/Cs2TeI6/Au device shows a good response for optoelectronic and X-ray detection, with a relatively high X-ray sensitivity of 27.8 μC Gy−1 cm−2 and a low detection limit of 72.5 nGy s−1.

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Title: Melt-grown large-sized Cs2TeI6 crystals for X-ray detection
Creators: Bao Xiao - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Fangbao Wang - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Meng Xu - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Xin Liu - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Qihao Sun - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Bin-Bin Zhang - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Wanqi Jie - State Key Laboratory of Solidification Processing, Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, and School of Materials Science and Engineering, Northwestern Polytechnical University
Paul Sellin - University of Surrey, School of Maths and Physics
Yadong Xu - University of Surrey, School of Computer Science and Electronic Engineering
Publication Details: CrystEngComm, Vol.22(31), pp.5130-5136
Publisher: Royal Society of Chemistry
Date published: 10/08/2020
Date accepted: 06/07/2020
Identifiers: 99545522902346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Melt-grown large-sized Cs2TeI6 crystals for X-ray detection

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