Effects of electrical stress on the characteristics and defect behaviors in GaN-based near-ultraviolet light emitting diodes

doi:10.1088/1674-1056/ac4cb8

Abstract The degradation mechanism of GaN-based near-ultraviolet (NUV, 320-400 nm) light emitting diodes (LEDs) with low-indium content under electrical stress is studied from the aspect of defects. A decrease in the optical power and an increase in the leakage current are observed after electrical stress. The defect behaviors are characterized using deep level transient spectroscopy (DLTS) measurement under different filling pulse widths. After stress, the concentration of defects with the energy level of 0.47-0.56 eV increases, accompanied by decrease in the concentration of 0.72-0.84 eV defects. Combing the defect energy level with the increased yellow luminescence in photoluminescence spectra, the device degradation can be attributed to the activation of the gallium vacancy and oxygen related complex defect along dislocation, which was previously passivated with hydrogen. This study reveals the evolution process of defects under electrical stress and their spatial location, laying a foundation for manufacture of GaN-based NUV LEDs with high reliability.

Keywords: light emitting diodes GaN electrical stress defect

Received: 24 November 2021
Revised: 26 December 2021
Accepted manuscript online: 19 January 2022

PACS:	81.05.Ea	(III-V semiconductors)
	85.60.Jb	(Light-emitting devices)
	73.21.Fg	(Quantum wells)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62104180, 61974115, 11690042, 61634005, 61974111, 12035019, and 61904142), and the Fundamental Research Funds for the Central Universities (Grant No. XJS221106), and the Key Research and Development Program of Shaanxi, China (Grant No. 2020ZDLGY03-05).

Corresponding Authors: Xue-Feng Zheng
E-mail: xfzheng@mail.xidian.edu.cn

Cite this article:

Ying-Zhe Wang(王颖哲), Mao-Sen Wang(王茂森), Ning Hua(化宁), Kai Chen(陈凯), Zhi-Min He(何志敏), Xue-Feng Zheng(郑雪峰), Pei-Xian Li(李培咸), Xiao-Hua Ma(马晓华), Li-Xin Guo(郭立新), and Yue Hao(郝跃) Effects of electrical stress on the characteristics and defect behaviors in GaN-based near-ultraviolet light emitting diodes 2022 Chin. Phys. B 31 068101

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Effects of electrical stress on the characteristics and defect behaviors in GaN-based near-ultraviolet light emitting diodes

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