Journal article

Publication year: 2021

Journal: Applied Physics Letters

Volume number: 119

Issue number: 5

ISSN: 0003-6951

eISSN: 1077-3118

Open access status: Hybrid

DOI Link: https://doi.org/10.1063/5.0060628

Publisher: American Institute of Physics

Abstract: 
beta-Ga2O3 is a wide bandgap semiconductor that is attractive for various applications, including power electronics and transparent conductive electrodes. Its properties can be strongly affected by transition metal impurities commonly present during the growth such as Cr. In this Letter, we determine the electronic structure of Cr3+ by performing a correlative study of magneto-photoluminescence (magneto-PL) and electron paramagnetic resonance. We unambiguously prove that the so-called R-1 and R-2 PL lines at around 1.79eV originate from an internal transition between the first excited state (E-2) and the (4)A(2) ground state of Cr3+. The center is concluded to have monoclinic local symmetry and exhibits a large zero-field splitting (similar to 147 mu eV) of the ground state, which can be directly measured from the fine structure of the R1 transition. Furthermore, g-values of the first excited state are accurately determined as g(a) = 1.7, g(b) = 1.5, and g(c*) = 2.1. Our results advance our understanding of the electronic structure of Cr in beta-Ga2O3 and provide a spectroscopic signature of this common residual impurity. (C) 2021 Author(s).

Harvard Citation style: Stehr, J., Jansson, M., Hofmann, D., Kim, J., Pearton, S., Chen, W., et al. (2021) Magneto-optical properties of Cr³⁺ in β-Ga₂O₃, Applied Physics Letters, 119(5), Article 052101. https://doi.org/10.1063/5.0060628

APA Citation style: Stehr, J., Jansson, M., Hofmann, D., Kim, J., Pearton, S., Chen, W., & Buyanova, I. (2021). Magneto-optical properties of Cr³⁺ in β-Ga₂O₃. Applied Physics Letters. 119(5), Article 052101. https://doi.org/10.1063/5.0060628