Open AccessHigh-performance nanowire ultraviolet light-emitting diodes with potassium hydroxide and ammonium sulfide surface passivation
Author(s) -
Ha Quoc Thang Bui,
Ravi Teja Velpula,
Barsha Jian,
Moab Rajan Philip,
Hien D. Tong,
Trupti Ranjan Lenka,
Hieu Pham Trung Nguyen
Publication year - 2020
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.400877
Subject(s) - passivation , materials science , light emitting diode , optoelectronics , ultraviolet , nanowire , electroluminescence , potassium hydroxide , diode , photoluminescence , nanotechnology , chemical engineering , layer (electronics) , engineering
Potassium hydroxide (KOH) and ammonium sulfide ( N H 4 ) 2 S x have been used as a surface passivation treatment to improve the electrical and optical performance of AlGaN nanowire ultraviolet (UV) light-emitting diodes (LEDs). Enhancements in photoluminescence at 335 nm (49%), optical output power (65%), and electroluminescence (83%), with respect to the as-grown nanowire LED are recorded for the AlGaN nanowire UV LEDs with surface passivation. These enhancements are attributed to the reduced nonradiative recombination on the nanowire surfaces. This study provides a potential surface passivation approach to produce high-power AlGaN nanowire LEDs operating in the UV spectrum.