Optical absorption of Fe in doped Ga2O3

Bhandari, Suman; Zvanut, M. E.; Varley, J. B.

doi:10.1063/1.5124825

Title: Optical absorption of Fe in doped Ga₂O₃

Journal Article · 25 October 2019 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5124825 · OSTI ID:1577937

^[1];

^[1]; Varley, J. B. ^[2]

Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

This study investigates the Fe impurities believed to act as deep acceptors that contribute to electrical compensation of the n-type conductivity in as-grown Ga₂O₃. A variation of the traditional optical absorption measurement, photoinduced electron paramagnetic resonance (EPR) spectroscopy, is used to identify charge transitions in bulk Fe-doped and Mg-doped Ga₂O₃ with the support of hybrid functional calculations. Steady-state photo-EPR measurements show that the first optically induced change in Fe³⁺ occurs at 1.2 eV, significantly larger than the calculated defect levels for Fe. However, the optical cross section spectrum determined from time-dependent photo-EPR measurements compare well with a calculated cross section spectrum for the Fe²⁺-to-Fe³⁺ transition when the relaxation energy predicted from the density functional theory is folded into the model. In conclusion, this work explicitly demonstrates the need for an accurate accounting of electron-lattice coupling when interpreting optically induced phenomena.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1577937

Alternate ID(s):: OSTI ID: 1571833

Report Number(s):: LLNL-JRNL-798701; 958413; TRN: US2102667

Journal Information:: Journal of Applied Physics, Vol. 126, Issue 16; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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