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Purely Organic 4HCB Single Crystal Exhibiting High Hole Mobility for Direct Detection of Ultralow-Dose X-Radiation

Abstract

Precise detection of low-dose X-radiation by the purely organic direct detectors is vital for tissue-equivalent dosimeter and safety control in medical radiation treatment, but it still remains a challenge. Here, we report on a promising organic radiation detector based on 4-hydroxycyanobenzene (4HCB, C7H5NO) single crystal. Plate-like 4HCB single crystals up to 18×15×1.2 mm3 in size are obtained by the optimized solvent evaporation method, thanks to the clarification of the two-dimensional nucleation growth mechanism. After the post surface treatment, the leakage current of 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 at the bias range of 40-100 V, which contributes 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) exposure.

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Supplementary files

Article information


Submitted
22 Nov 2019
Accepted
04 Feb 2020
First published
05 Feb 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Purely Organic 4HCB Single Crystal Exhibiting High Hole Mobility for Direct Detection of Ultralow-Dose X-Radiation

D. Zhao, M. Xu, B. Xiao, B. Zhang, L. Yan, G. Zeng, A. Dubois, P. Sellin, W. Jie and Y. Xu, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA12817D

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