Fabrication and performance evaluation of GaN thermal neutron detectors with 6 LiF conversion layer

A GaN-based pin neutron detector with a 6 LiF conversion layer was fabricated, and can be used to detect thermal neutrons. Measurement of the electrical characteristic of the GaN-based pin neutron detector showed that the reverse leakage current of the neutron detector was reduced significantly afte...

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Bibliographic Details
Published in:Chinese physics B 2020-09, Vol.29 (9), p.90401
Main Authors: Zhu, Zhifu, Sun, Zhijia, Zou, Jijun, Tang, Bin, Xiu, Qinglei, Wang, Renbo, Qu, Jinhui, Deng, Wenjuan, Wang, Shaotang, Peng, Junbo, Wang, Zhidong, Zhang, Haiping
Format: Article
Language:English
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Summary:A GaN-based pin neutron detector with a 6 LiF conversion layer was fabricated, and can be used to detect thermal neutrons. Measurement of the electrical characteristic of the GaN-based pin neutron detector showed that the reverse leakage current of the neutron detector was reduced significantly after deposition of a 6 LiF conversion layer on the detector surface. The thermal neutrons used in this experiment were obtained from an 241 Am–Be fast neutron source after being moderated by 100-mm-thick high-density polyethylene. The experimental results show that the detector with 16.9-μm thick 6 LiF achieved a maximum neutron detection efficiency of 1.9% at a reverse bias of 0 V, which is less than the theoretical detection efficiency of 4.1% calculated for our GaN neutron detectors.
ISSN:1674-1056
DOI:10.1088/1674-1056/ab9c05