Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, volume 41, issue 3

Transport and trap states in proton irradiated ultra-thick κ-Ga2O3

V.I. Nikolaev 1, 2
A. I. Pechnikov 1, 2
Peter Lagov 1, 4
A. Vasilev 1
А. I. Kochkova 1
A. M. Chernykh 1
In-Hwan Lee 5
Show full list: 11 авторов
Publication typeJournal Article
Publication date2023-04-27
scimago Q2
wos Q3
SJR0.473
CiteScore3.9
Impact factor2.1
ISSN07342101, 15208559
Surfaces, Coatings and Films
Condensed Matter Physics
Surfaces and Interfaces
Abstract

Changes induced by irradiation with 1.1 MeV protons in the transport properties and deep trap spectra of thick (>80 μm) undoped κ-Ga2O3 layers grown on sapphire are reported. Prior to irradiation, the films had a donor concentration of ∼1015 cm−3, with the two dominant donors having ionization energies of 0.25 and 0.15 eV, respectively. The main electron traps were located at Ec−0.7 eV. Deep acceptor spectra measured by capacitance-voltage profiling under illumination showed optical ionization thresholds near 2, 2.8, and 3.4 eV. The diffusion length of nonequilibrium charge carriers for ɛ-Ga2O3 was 70 ± 5 nm prior to irradiation. After irradiation with 1.1 MeV protons to a fluence of 1014 cm−2, there was total depletion of mobile charge carriers in the top 4.5 μm of the film, close to the estimated proton range. The carrier removal rate was 10–20 cm−1, a factor of 5–10 lower than in β-Ga2O3, while the concentration of deep acceptors in the lower half of the bandgap and the diffusion length showed no significant change.

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