Realization of highly efficient hexagonal boron nitride neutron detectors
Abstract
Here, we report the achievement of highly efficient 10B enriched hexagonal boron nitride (h- 10BN) direct conversion neutron detectors. These detectors were realized from freestanding 4-in. diameter h- 10BN wafers 43 μm in thickness obtained from epitaxy growth and subsequent mechanical separation from sapphire substrates. Both sides of the film were subjected to ohmic contact deposition to form a simple vertical “photoconductor-type” detector. Transport measurements revealed excellent vertical transport properties including high electrical resistivity (>1013 Ω cm) and mobility-lifetime (μτ) products. A much larger μτ product for holes compared to that of electrons along the c-axis of h- BN was observed, implying that holes (electrons) behave like majority (minority) carriers in undoped h- BN. Exposure to thermal neutrons from a californium-252 (252Cf) source moderated by a high density polyethylene moderator reveals that 43 μm h- 10BN detectors possess 51.4% detection efficiency at a bias voltage of 400 V, which is the highest reported efficiency for any semiconductor-based neutron detector. The results point to the possibility of obtaining highly efficient, compact solid-state neutron detectors with high gamma rejection and low manufacturing and maintenance costs.
- Authors:
-
- Texas Tech Univ., Lubbock, TX (United States)
- Publication Date:
- Research Org.:
- Texas Tech Univ., Lubbock, TX (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); US Department of Homeland Security (DHS)
- OSTI Identifier:
- 1330680
- Alternate Identifier(s):
- OSTI ID: 1295951
- Grant/Contract Number:
- NA0002927; 2011-DN- 077-ARI048; ECCS-1402886
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 109; Journal Issue: 7; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; wide bandgap semiconductors; solid-state neutron detector materials; direct conversion neutron detectors; He-3 gap replacement detectors; III-V semiconductors; neutrons; electrons; transport properties; electrical resistivity
Citation Formats
Maity, A., Doan, T. C., Li, J., Lin, J. Y., and Jiang, H. X. Realization of highly efficient hexagonal boron nitride neutron detectors. United States: N. p., 2016.
Web. doi:10.1063/1.4960522.
Maity, A., Doan, T. C., Li, J., Lin, J. Y., & Jiang, H. X. Realization of highly efficient hexagonal boron nitride neutron detectors. United States. https://doi.org/10.1063/1.4960522
Maity, A., Doan, T. C., Li, J., Lin, J. Y., and Jiang, H. X. Tue .
"Realization of highly efficient hexagonal boron nitride neutron detectors". United States. https://doi.org/10.1063/1.4960522. https://www.osti.gov/servlets/purl/1330680.
@article{osti_1330680,
title = {Realization of highly efficient hexagonal boron nitride neutron detectors},
author = {Maity, A. and Doan, T. C. and Li, J. and Lin, J. Y. and Jiang, H. X.},
abstractNote = {Here, we report the achievement of highly efficient 10B enriched hexagonal boron nitride (h- 10BN) direct conversion neutron detectors. These detectors were realized from freestanding 4-in. diameter h- 10BN wafers 43 μm in thickness obtained from epitaxy growth and subsequent mechanical separation from sapphire substrates. Both sides of the film were subjected to ohmic contact deposition to form a simple vertical “photoconductor-type” detector. Transport measurements revealed excellent vertical transport properties including high electrical resistivity (>1013 Ω cm) and mobility-lifetime (μτ) products. A much larger μτ product for holes compared to that of electrons along the c-axis of h- BN was observed, implying that holes (electrons) behave like majority (minority) carriers in undoped h- BN. Exposure to thermal neutrons from a californium-252 (252Cf) source moderated by a high density polyethylene moderator reveals that 43 μm h- 10BN detectors possess 51.4% detection efficiency at a bias voltage of 400 V, which is the highest reported efficiency for any semiconductor-based neutron detector. The results point to the possibility of obtaining highly efficient, compact solid-state neutron detectors with high gamma rejection and low manufacturing and maintenance costs.},
doi = {10.1063/1.4960522},
journal = {Applied Physics Letters},
number = 7,
volume = 109,
place = {United States},
year = {Tue Aug 16 00:00:00 EDT 2016},
month = {Tue Aug 16 00:00:00 EDT 2016}
}
Web of Science
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