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Purely organic 4HCB single crystals exhibiting high hole mobility for direct detection of ultralow-dose X-radiation

Zhao, Dou, Xu, Meng, Xiao, Bao, Zhang, Binbin, Yan, Lei, Zeng, Guoqiang, Dubois, Alain, Sellin, Paul, Jie, Wanqi and Xu, Yadong (2020) Purely organic 4HCB single crystals exhibiting high hole mobility for direct detection of ultralow-dose X-radiation Journal of Materials Chemistry A, 8 (10). pp. 5217-5226.

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Precise detection of low-dose X-radiation using purely organic direct detectors is vital for tissue-equivalent dosimeters and safety control in medical radiation treatment, but it still remains a challenge. Here, we report a promising organic radiation detector based on 4-hydroxycyanobenzene (4HCB, C7H5NO) single crystals. Plate-like 4HCB single crystals up to 18 × 15 × 1.2 mm3 in size are obtained by an optimized solvent evaporation method, thanks to the clarification of the two-dimensional nucleation growth mechanism. After post surface treatment, the leakage current of the 4HCB detector is no larger than 0.1 pA under an electric field of 600 V cm−1. The fabricated detectors show a capability of detecting 241Am 5.49 MeV α particles with a well resolved full energy peak. The calculated hole mobility (μh) and hole mobility lifetime product (μτ)h are 3.40 cm2 V−1 s−1 and 8.50 × 10−5 cm2 V−1, respectively. Simultaneously, under a 50 kVp X-ray beam, a detection limit as low as 0.29 μGyair s−1 with a high sensitivity of 10 μC Gyair−1 cm−2 is achieved in the bias range of 40–100 V, contributing to a superior X-ray imaging capability with a spatial resolution of 0.9 lp mm−1 at a low-dose rate (below 150 μGyair s−1) of exposure.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Zhao, Dou
Xiao, Bao
Zhang, Binbin
Yan, Lei
Zeng, Guoqiang
Dubois, Alain
Jie, Wanqi
Xu, Yadong
Date : 5 February 2020
DOI : 10.1039/C9TA12817D
Copyright Disclaimer : © The Royal Society of Chemistry 2020
Depositing User : Clive Harris
Date Deposited : 07 May 2020 15:24
Last Modified : 07 May 2020 15:56

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