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arXiv · 2005.13743

Red Luminescence in H-doped beta-Ga2O3

Thanh Tung Huynh·Ekaterine Chikoidze·Curtis P. Irvine·Muhammad Zakria·Yves Dumont·Ferechteh H. Teherani·Eric V. Sandana·Philippe Bove·David J. Rogers·Matthew R. Phillips·Cuong Ton-That
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Abstract

The effects of hydrogen incorporation into beta-Ga2O3 thin films have been investigated by chemical, electrical and optical characterization techniques. Hydrogen incorporation was achieved by remote plasma doping without any structural alterations of the film; however, X-ray photoemission reveals major changes in the oxygen chemical environment. Depth-resolved cathodoluminescence (CL) reveals that the near-surface region of the H-doped Ga2O3 film exhibits a distinct red luminescence (RL) band at 1.9 eV. The emergence of the H-related RL band is accompanied by an enhancement in the electrical conductivity of the film by an order of magnitude. Temperature-resolved CL points to the formation of abundant H-related donors with a binding energy of 28 +/- 4 meV. The RL emission is attributed to shallow donor-deep acceptor pair recombination, where the acceptor is a VGa-H complex and the shallow donor is interstitial H. The binding energy of the VGa-H complex, based on our experimental considerations, is consistent with the computational results by Varley et al [J. Phys.: Condens. Matter, 23, 334212, 2011].

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Thanh Tung Huynh, Ekaterine Chikoidze, Curtis P. Irvine, Muhammad Zakria, Yves Dumont, Ferechteh H. Teherani, Eric V. Sandana, Philippe Bove, David J. Rogers, Matthew R. Phillips, Cuong Ton-That. 2020-05-28. Red Luminescence in H-doped beta-Ga2O3. https://doi.org/10.1103/physrevmaterials.4.085201

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