Probing the surface oxidation process in hexagonal boron nitride epilayers

Wang, Q. W.; Li, J.; Lin, J. Y.; Jiang, H. X.

doi:10.1063/1.5134993

Title: Probing the surface oxidation process in hexagonal boron nitride epilayers

Journal Article · 10 February 2020 · AIP Advances

DOI: https://doi.org/10.1063/1.5134993 · OSTI ID:1801142

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Texas Tech Univ., Lubbock, TX (United States). Dept. of Electrical and Computer Engineering

Thermal neutron detectors based on hexagonal boron nitride (h-BN) epilayers have demonstrated a record high efficiency among solid-state detectors at 58%. It was found that the performance of h-BN detectors is profoundly influenced by charge recombination at the surfaces. The dynamic process of surface oxidation in h-BN epilayers has been probed by x-ray photoelectron spectroscopy. The spectra of high-resolution (0.1 eV) scans indicated that the linewidth of the B 1s peak at 190.6 eV increased and the peak intensity decreased with an increase in exposure time in-air (t_air). The main B 1s peak at 190.6 eV evolved into multiple peaks at a higher binding energy position due to oxygen impurities tending to occupy nitrogen sites and form the B–O bond. Time constants of the oxidation process have been determined, revealing that the formation process of the B–O bond is very fast and within minutes in h-BN. The results suggest that reducing nitrogen vacancy generation during growth and employing surface treatment techniques would further improve the performance of h-BN devices.

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Research Organization:: Texas Tech Univ., Lubbock, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: NA0002927; AR000964

OSTI ID:: 1801142

Alternate ID(s):: OSTI ID: 1598727

Journal Information:: AIP Advances, Vol. 10, Issue 2; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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36 MATERIALS SCIENCE
Chemical vapor deposition
Neutron detectors
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2D materials
X-ray photoelectron spectroscopy
Passivation
Oxidation processes

Title: Probing the surface oxidation process in hexagonal boron nitride epilayers

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