Iron as a source of efficient Shockley-Read-Hall recombination in GaN
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.
- Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
- Univ. of California, Santa Barbara, CA (United States). Materials Dept.; Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
- Univ. of Vienna (Austria). Faculty of Physics, Computational Materials Physics
- KTH Royal Inst. of Technology, Stockholm (Sweden). Dept. of Materials and Nano Physics
- Center for Physical Sciences and Technology, Vilnius (Lithuania)
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 (1015 cm–3) leads to nanosecond nonradiative recombination lifetimes, which can be detrimental for the efficiency of electronic and optoelectronic devices.
- Research Organization:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union (EU)
- Grant/Contract Number:
- SC0010689; AC02-05CH11231; 657054
- OSTI ID:
- 1465786
- Alternate ID(s):
- OSTI ID: 1329497
- Journal Information:
- Applied Physics Letters, Vol. 109, Issue 16; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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