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Title: Role of point defects in the electrical and optical properties of In 2 O 3

Journal Article · · Physical Review Materials
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [6];  [2]
  1. Univ. of Delaware, Newark, DE (United States); Kasetsart Univ., Bangkok (Thailand)
  2. Univ. of Delaware, Newark, DE (United States)
  3. Kasetsart Univ., Bangkok (Thailand); Thailand Center of Excellence in Physics (ThEP Center), Bangkok (Thailand)
  4. The Inst. for the Promotion of Teaching Science and Technology, Bangkok (Thailand)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Univ. of California, Santa Barbara, CA (United States)

Using hybrid density-functional calculations we investigate the effects of native point defects on the electrical and optical properties of In2O3. We analyze formation energies, transition levels, and local lattice relaxations for all native point defects. We find that donor defects are in general more energetically favorable than acceptor defects, except near O-rich conditions, where oxygen interstitials and indium vacancies have low formation energy in n-type In2O3. The oxygen vacancy is the lowest-energy donor defect with transition level (2+/+) slightly below and (+/0) slightly above the conduction-band minimum (CBM), with a predicted luminescence peak at 2.3 eV associated with the transition $$V$$ $$^{0}_{O}$$ → $$V$$ $$^{+}_{O}$$. Despite being a shallow donor, the oxygen vacancy becomes electrically inactive for Fermi levels at or higher than ~0.1 eV above the CBM. As a result, this indicates that conductivity due to oxygen vacancies will saturate at rather low carrier concentrations when compared to typical carrier concentrations required for transparent conducting oxides in many device applications.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1577946
Report Number(s):
LLNL-JRNL--792281; 990446
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 7 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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