Persistent Room-Temperature Photodarkening in Cu-Doped β-Ga2O3

Jesenovec, J.; Pansegrau, C.; McCluskey, M. D.; McCloy, J. S.; Gustafson, T. D.; Halliburton, L. E.; Varley, J. B.

doi:10.1103/physrevlett.128.077402

Title: Persistent Room-Temperature Photodarkening in Cu-Doped β - Ga 2 O 3

Journal Article · 15 February 2022 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.128.077402 · OSTI ID:1867090

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Washington State Univ., Pullman, WA (United States)
Wright-Patterson Air Force Base, Dayton, OH (United States)
West Virginia Univ., Morgantown, WV (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

β–Ga₂O₃ is an ultrawide band gap semiconductor with emerging applications in power electronics. Here, the introduction of acceptor dopants yields semi-insulating substrates necessary for thin-film devices. In the present work, exposure of Cu-doped β–Ga₂O₃ to UV light > 4 eV is shown to cause large, persistent photo-induced darkening at room temperature. Electron paramagnetic resonance spectroscopy indicates that light exposure converts Cu²⁺ to Cu³⁺, a rare oxidation state that is responsible for the optical absorption. The photodarkening is accompanied by the appearance of O–H vibrational modes in the infrared spectrum. Hybrid function calculations show that Cu acceptors can favorably complex with hydrogen donors incorporated as interstitial (Hi) or substitutional (HO) defects. When Cu_Ga–HO complexes absorb light, hydrogen is released, contributing to the observed Cu³⁺ species and O–H modes.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Washington State Univ., Pullman, WA (United States)

Sponsoring Organization:: Air Force Office of Scientific Research; LLNL Laboratory Directed Research and Development; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC52-07NA27344; FG02-07ER46386

OSTI ID:: 1867090

Report Number(s):: LLNL-JRNL-834156; 1052559

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 128; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Persistent Room-Temperature Photodarkening in Cu-Doped β - Ga 2 O 3

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