Editors' Choice—Hydrogen Centers in β-Ga2O3: Infrared Spectroscopy and Density Functional Theory. (6th March 2019)

• Record Type: Journal Article
• Authors: Qin, Ying; Stavola, Michael; Fowler, W. Beall; Weiser, Philip; Pearton, Stephen J.
• Is Part Of: ECS journal of solid state science and technology. Volume 8:Number 7(2019)
• Page Start: Q3103
• Page End: Q3110
• Publication Date: 2019-03-06
• Subjects: Semiconductors -- Ga2O3 -- hydrogen impurities -- vibrational proproperties; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2.0221907jss
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : β-Ga2 O3 is a transparent conducting oxide with a wide bandgap (4.9 eV) whose properties are generating widespread interest. It has been found that hydrogen can play a key role in the conductivity of Ga2 O3 by passivating deep defects and acting as a shallow donor. Recent vibrational spectroscopy experiments have found a dominant hydrogen center with a polarized O-H line at 3437 cm −1 . These experiments along with theoretical analysis assign this line to a defect consisting of two equivalent H atoms trapped at a relaxed Ga vacancy. An expansion of this research has involved annealing treatments as well as measurements at different crystal orientations. These results have discovered a reservoir of "hidden" hydrogen in Ga2 O3 whose identification involves a variety of hydrogen centers associated with the Ga vacancy, as well as other possible species.