Proton irradiation effects on deep level states in Mg-doped p-type GaN grown by ammonia-based molecular beam epitaxy
Abstract
The impact of proton irradiation on the deep level states throughout the Mg-doped p-type GaN bandgap is investigated using deep level transient and optical spectroscopies. Exposure to 1.8 MeV protons of 1 × 1013 cm−2 and 3 × 1013 cm−2 fluences not only introduces a trap with an EV + 1.02 eV activation energy but also brings monotonic increases in concentration for as-grown deep states at EV + 0.48 eV, EV + 2.42 eV, EV + 3.00 eV, and EV + 3.28 eV. The non-uniform sensitivities for individual states suggest different physical sources and/or defect generation mechanisms. Comparing with prior theoretical calculations reveals that several traps are consistent with associations to nitrogen vacancy, nitrogen interstitial, and gallium vacancy origins, and thus are likely generated through displacing nitrogen and gallium atoms from the crystal lattice in proton irradiation environment.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 12, 2015
- Source ID
- 10.1063/1.4905783
Entities
People
- Aaron R. Arehart
- D. M. Fleetwood
- E. C. H. Kyle
- En Xia Zhang
- James S. Speck
- Jiayu Chen
- Ronald D. Schrimpf
- Steven A. Ringel
- Zhicai Zhang
Organizations
- Defense Threat Reduction Agency
- Office of Naval Research
- Ohio State University
- University of California
- Vanderbilt University