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Enhancing Efficiency of AlGaN Ultraviolet‐B Light‐Emitting Diodes with Graded p ‐ AlGaN Hole Injection Layer
Author(s) -
Bui Ha Quoc Thang,
Dang Hoang Anh,
Doan Thi Tuyet,
Velpula Ravi Teja,
Jain Barsha,
Nguyen Hieu Pham Trung,
Nguyen Hoang-Duy
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202100003
Subject(s) - electroluminescence , materials science , optoelectronics , light emitting diode , diode , ultraviolet , layer (electronics) , active layer , electron , wavelength , nanotechnology , physics , quantum mechanics , thin film transistor
Ultraviolet‐B (UVB) AlGaN light‐emitting diodes (LEDs) with a hybrid hole injection layer comprising a 5 nm thin p‐Al x Ga (1− x ) N linearly graded layer (LGL), x from 0.65 to 0.50, and a 15 nm conventional p‐AlGaN layer are proposed for ≈284 nm wavelength emission. The introduced p‐Al x Ga (1− x ) N LGL effectively improves the confinement of the electrons in the active region by effectively increasing the conduction band barrier height. Moreover, it enhances the hole injection capability into the active region by energizing the holes that minimize the effective valence band barrier height. As a result, the proposed LED structure exhibits an incredibly reduced electron leakage, ten times lower than that of the conventional structure. Moreover, the output power and electroluminescence intensity of the proposed structure are enhanced by approximately twice at 60 mA current injection. Thus, the LGL LED structure can be a potential candidate for high‐power UV light emitters.