Comprehensive characterization of nitrogen-related defect states in β-Ga2O3 using quantitative optical and thermal defect spectroscopy methods

Author:

Ghadi Hemant1ORCID,Cornuellue Evan1,Mcglone Joe F.1ORCID,Senckowski Alexander2ORCID,Sharma Shivam3,Wong Man Hoi2ORCID,Singisetti Uttam3ORCID,Ringel Steven A.1ORCID

Affiliation:

1. Electrical and Computer Engineering, The Ohio State University 1 , Columbus, Ohio 43210, USA

2. Electrical and Computer Engineering, University of Massachusetts Lowell 2 , Lowell, Massachusetts 01854, USA

3. Electrical Engineering, University of Buffalo 3 , Buffalo, New York 14228, USA

Abstract

This study provides a comprehensive analysis of the dominant deep acceptor level in nitrogen-doped beta-phase gallium oxide (β-Ga2O3), elucidating and reconciling the hole emission features observed in deep-level optical spectroscopy (DLOS). The unique behavior of this defect, coupled with its small optical cross section, complicates trap concentration analysis using DLOS, which is essential for defect characterization in β-Ga2O3. A complex feature arises in DLOS results due to simultaneous electron emission to the conduction band and hole emission to the valence band from the same defect state, indicating the formation of two distinct atomic configurations and suggesting metastable defect characteristics. This study discusses the implications of this behavior on DLOS analysis and employs advanced spectroscopy techniques such as double-beam DLOS and optical isothermal measurements to address these complications. The double-beam DLOS method reveals a distinct hole emission process at EV+1.3 eV previously obscured in conventional DLOS. Optical isothermal measurements further characterize this energy level, appearing only in N-doped β-Ga2O3. This enables an estimate of the β-Ga2O3 hole effective mass by analyzing temperature-dependent carrier emission rates. This work highlights the impact of partial trap-filling behavior on DLOS analysis and identifies the presence of hole trapping and emission in β-Ga2O3. Although N-doping is ideal for creating semi-insulating material through the efficient compensation of free electrons, this study also reveals a significant hole emission and migration process within the weak electric fields of the Schottky diode depletion region.

Funder

Air Force Office of Scientific Research

U.S. Air Force Radiation Effects Center of Excellence

National Science Foundation

Publisher

AIP Publishing

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