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Title: Influence of Polymorphism on the Electronic Structure of Ga2O3

Journal Article · · Chemistry of Materials
 [1]; ORCiD logo [2];  [3];  [3];  [3];  [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [7];  [7]; ORCiD logo [7];  [1]; ORCiD logo [8];  [8]; ORCiD logo [9] more »;  [10]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [11] « less
  1. Univ. of Liverpool (United Kingdom)
  2. Humboldt Univ. of Berlin (Germany)
  3. Leibniz Inst. for Zoo and Wildlife Research, Berlin (Germany)
  4. Univ. of Bremen (Germany)
  5. Justus Liebig Univ., Giessen (Germany)
  6. Technical Univ. of Berlin (Germany)
  7. Binghamton Univ., NY (United States)
  8. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  9. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  10. Friedrich Schiller Univ., Jena (Germany)
  11. Univ. College London (United Kingdom)

The search for new wide-band-gap materials is intensifying to satisfy the need for more advanced and energy-efficient power electronic devices. Ga2O3 has emerged as an alternative to SiC and GaN, sparking a renewed interest in its fundamental properties beyond the main β-phase. Here, three polymorphs of Ga2O3, α, β, and ε, are investigated using X-ray diffraction, X-ray photoelectron and absorption spectroscopy, and ab initio theoretical approaches to gain insights into their structure–electronic structure relationships. Valence and conduction electronic structure as well as semicore and core states are probed, providing a complete picture of the influence of local coordination environments on the electronic structure. State-of-the-art electronic structure theory, including all-electron density functional theory and many-body perturbation theory, provides detailed understanding of the spectroscopic results. The calculated spectra provide very accurate descriptions of all experimental spectra and additionally illuminate the origin of observed spectral features. This paper provides a strong basis for the exploration of the Ga2O3 polymorphs as materials at the heart of future electronic device generations.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); National Science Foundation (NSF); Engineering and Physical Sciences Research Council (EPSRC)
Grant/Contract Number:
AC52-07NA27344; AC02- 06CH11357; DMREF-1627583; EP/P001513/1
OSTI ID:
1668469
Report Number(s):
LLNL-JRNL-811529; 1018249
Journal Information:
Chemistry of Materials, Vol. na, Issue na; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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