Simultaneous Specimen Current and Time-dependent Cathodoluminescence Measurements on Gallium Nitride
Abstract
Time-dependent cathodoluminescence (CL) and specimen current (SC) are monitored to evaluate trapping behavior and evolution of charge storage. Examination of CL and SC suggests that the near band edge emission in GaN is reduced primarily by the activation of traps upon irradiation, and Gallium vacancies are prime candidates. At the steady state, measurement of the stored charge by empiric-analytical methods suggests that all available traps within the interaction volume have been filled, and that additional charge is being stored interstitially, necessarily beyond the interaction volume. Once established, the space charge region is responsible for the steady state CL emission and, prior to build up, it is responsible for the generation of diffusion currents. Since the non-recombination effects resulting from diffusion currents that develop early on are analogous to those leading to device failure upon aging, this study is fundamental toward a holistic insight into optical properties in GaN.
Recommended Citation
E. M. Campo et al., "Simultaneous Specimen Current and Time-dependent Cathodoluminescence Measurements on Gallium Nitride," Journal of Applied Physics, vol. 119, no. 24, article no. 245108, American Institute of Physics, Jun 2016.
The definitive version is available at https://doi.org/10.1063/1.4954685
Department(s)
Electrical and Computer Engineering
Publication Status
Available Access
International Standard Serial Number (ISSN)
1089-7550; 0021-8979
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 American Institute of Physics, All rights reserved.
Publication Date
28 Jun 2016