Deep‐Level Defects and Impurities in InGaN Alloys
Abstract
In this study, density functional theory calculations with a hybrid functional are used to examine the charge‐state transition levels of native point defects and impurities in InGaN alloys, with the goal of identifying centers that play a role in defect‐assisted recombination. Explicit alloy calculations are used to monitor the dependence of defect levels on indium content and distribution of In atoms. The relative shift (or lack thereof) of the charge‐state transition levels of the different defects is explained by the atomic character of the defect state and whether it is derived from valence‐band or conduction‐band states of the host material or acts as an atomic‐like impurity. The various possible atomic configurations of In and Ga cations for a given composition of InGaN lead to a distribution of charge‐state transition levels. Defects on the nitrogen site lead to a larger spread in levels compared with defects on the cation site.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 20, 2019
- Source ID
- 10.1002/pssb.201900534
Entities
People
- Audrius Alkauskas
- Chris G. Van de Walle
- Cyrus E. Dreyer
- Darshana Wickramaratne
- Jimmy-xuan Shen
- John L. Lyons
Organizations
- Center for Physical Sciences and Technology
- National Research Council
- Office of Naval Research
- Stony Brook University
- United States Department of Energy
- United States Naval Research Laboratory
- University of California