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Title: Iron as a source of efficient Shockley-Read-Hall recombination in GaN

Transition metal impurities are known to adversely affect the efficiency of electronic and optoelectronic devices by introducing midgap defect levels that can act as efficient Shockley-Read-Hall centers. Iron impurities in GaN do not follow this pattern: their defect level is close to the conduction band and hence far from midgap. Here, using hybrid functional first-principles calculations, we uncover the electronic properties of Fe and we demonstrate that its high efficiency as a nonradiative center is due to a recombination cycle involving excited states. Unintentional incorporation of iron impurities at modest concentrations (10 15 cm –3) leads to nanosecond nonradiative recombination lifetimes, which can be detrimental for the efficiency of electronic and optoelectronic devices.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4] ; ORCiD logo [4] ; ORCiD logo [4] ; ORCiD logo [5] ;  [6] ;  [1]
  1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  2. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  3. Univ. of California, Santa Barbara, CA (United States). Materials Dept.; Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  4. Univ. of Vienna (Austria). Faculty of Physics, Computational Materials Physics
  5. KTH Royal Inst. of Technology, Stockholm (Sweden). Dept. of Materials and Nano Physics
  6. Center for Physical Sciences and Technology, Vilnius (Lithuania)
Publication Date:
Grant/Contract Number:
SC0010689; AC02-05CH11231; 657054
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 16; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Union (EU)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1465786
Alternate Identifier(s):
OSTI ID: 1329497