The Influence Of Point Defects And Dislocation On AlGaN-Based Deep Ultraviolet LEDs

Ma, Zhanhong; Almalki, Abdulaziz; Yang, Xin; Wu, Xing; Xi, Xin; Li, Jing; Lin, Shan; Li, Xiaodong; Alotaibi, Saud; Al huwayzce, Maryam; Henini, Mohamed; Zhao, Lixia

Abstract

AlGaN-based deep ultraviolet LEDs with high Al composition are promising for many applications, including air- or water-purification, fluorescence sensing, etc. However, to realize their full potential, it is important to understand the impact of the point defects on the device performance. Here, we investigate the defects in the 265 nm AlGaN-based deep ultraviolet LEDs after degradation systematically with a combination of different analytical technologies. The results show that point defects increase after the degradation. The generated defects during the stress lead to a carrier redistribution in the active region and the induced point defects during the degradation are located within the multi-quantum wells (MQWs) region, especially in the first quantum well near the p side of the LED chip. The dislocation lines in the MQWs region were also observed after the degradation, which can lead to the Mg diffusion along the dislocation line. These findings are important to understand the defects in AlGaN quantum wells and further improve AlGaN-based deep ultraviolet LEDs’ performance.

Citation

Ma, Z., Almalki, A., Yang, X., Wu, X., Xi, X., Li, J., …Zhao, L. (2020). The Influence Of Point Defects And Dislocation On AlGaN-Based Deep Ultraviolet LEDs. Journal of Alloys and Compounds, 845, Article 156177. https://doi.org/10.1016/j.jallcom.2020.156177

• Journal Article Type: Article
• Acceptance Date: Jun 22, 2020
• Online Publication Date: Jun 26, 2020
• Publication Date: Dec 10, 2020
• Deposit Date: Aug 19, 2020
• Publicly Available Date: Jun 27, 2021
• Journal: Journal of Alloys and Compounds
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 845
• Article Number: 156177
• DOI: https://doi.org/10.1016/j.jallcom.2020.156177
• Public URL: https://nottingham-repository.worktribe.com/output/4843053
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S092583882032541X