TY - JOUR
T1 - Purely organic 4HCB single crystals exhibiting high hole mobility for direct detection of ultralow-dose X-radiation
AU - Zhao, Dou
AU - Xu, Meng
AU - Xiao, Bao
AU - Zhang, Binbin
AU - Yan, Lei
AU - Zeng, Guoqiang
AU - Dubois, Alain
AU - Sellin, Paul
AU - Jie, Wanqi
AU - Xu, Yadong
N1 - Publisher Copyright:
This journal is © The Royal Society of Chemistry.
PY - 2020/3/14
Y1 - 2020/3/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85081610736&partnerID=8YFLogxK
U2 - 10.1039/c9ta12817d
DO - 10.1039/c9ta12817d
M3 - 文章
AN - SCOPUS:85081610736
SN - 2050-7488
VL - 8
SP - 5217
EP - 5226
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 10
ER -
