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Title: Charge collection in h -BN neutron detectors at elevated temperatures

Abstract

Many of the neutron detector applications are in the environments with harsh conditions such as high temperatures. We report here the measurements of charge collection parameters of hexagonal boron nitride (h-BN) detectors at elevated temperatures, including the electron mobility-lifetime product (μτ) and surface recombination field (s/μ). It was found that μτ is increased, while s/μ is decreased as temperature increases. The temperature dependence of the surface recombination field (s/μ) revealed that electrons trapped in the surface states tend to thermally activate to the bulk region at higher temperatures with an activation energy of about 0.22 eV, leading to a reduction in the density of the charged surface states at elevated temperatures. Consequently, the charge collection efficiency is enhanced at elevated temperatures due to a reduced surface recombination field and increased electron mobility-lifetime product. The results suggested that h-BN neutron detectors are favorable for high temperature operation.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
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  1. Texas Tech University, Lubbock, TX (United States). Department of Electrical and Computer Engineering
Publication Date:
Research Org.:
Texas Tech Univ., Lubbock, TX (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1848322
Alternate Identifier(s):
OSTI ID: 1769450
Grant/Contract Number:  
AR0000964; AR0001257
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 9; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Physics; neutron detectors; thermal instruments; electron traps; electronic transport; semiconductor structures; photoconductivity; passivation; chemical bonding; photoexcitations; surface states

Citation Formats

Li, J., Maity, A., Grenadier, S. J., Lin, J. Y., and Jiang, H. X. Charge collection in h -BN neutron detectors at elevated temperatures. United States: N. p., 2021. Web. doi:10.1063/5.0044159.
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Li, J., Maity, A., Grenadier, S. J., Lin, J. Y., & Jiang, H. X. Charge collection in h -BN neutron detectors at elevated temperatures. United States. https://doi.org/10.1063/5.0044159
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Li, J., Maity, A., Grenadier, S. J., Lin, J. Y., and Jiang, H. X. Fri . "Charge collection in h -BN neutron detectors at elevated temperatures". United States. https://doi.org/10.1063/5.0044159. https://www.osti.gov/servlets/purl/1848322.
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@article{osti_1848322,
title = {Charge collection in h -BN neutron detectors at elevated temperatures},
author = {Li, J. and Maity, A. and Grenadier, S. J. and Lin, J. Y. and Jiang, H. X.},
abstractNote = {Many of the neutron detector applications are in the environments with harsh conditions such as high temperatures. We report here the measurements of charge collection parameters of hexagonal boron nitride (h-BN) detectors at elevated temperatures, including the electron mobility-lifetime product (μτ) and surface recombination field (s/μ). It was found that μτ is increased, while s/μ is decreased as temperature increases. The temperature dependence of the surface recombination field (s/μ) revealed that electrons trapped in the surface states tend to thermally activate to the bulk region at higher temperatures with an activation energy of about 0.22 eV, leading to a reduction in the density of the charged surface states at elevated temperatures. Consequently, the charge collection efficiency is enhanced at elevated temperatures due to a reduced surface recombination field and increased electron mobility-lifetime product. The results suggested that h-BN neutron detectors are favorable for high temperature operation.},
doi = {10.1063/5.0044159},
journal = {Applied Physics Letters},
number = 9,
volume = 118,
place = {United States},
year = {Fri Mar 05 00:00:00 EST 2021},
month = {Fri Mar 05 00:00:00 EST 2021}
}
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https://doi.org/10.1063/5.0044159
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