High-performance nanowire ultraviolet light-emitting diodes with potassium hydroxide and ammonium sulfide surface passivation

Ha Quoc Thang Bui; Ravi Teja Velpula; Barsha Jian; Moab Rajan Philip; Hien Duy Tong; Trupti Rajan Lenka; Hieu Pham Trung Nguyen

doi:10.1364/AO.400877

High-performance nanowire ultraviolet light-emitting diodes with potassium hydroxide and ammonium sulfide surface passivation

Appl Opt. 2020 Aug 20;59(24):7352-7356. doi: 10.1364/AO.400877.

Authors

Ha Quoc Thang Bui, Ravi Teja Velpula, Barsha Jian, Moab Rajan Philip, Hien Duy Tong, Trupti Rajan Lenka, Hieu Pham Trung Nguyen

PMID: 32902502
DOI: 10.1364/AO.400877

Abstract

Potassium hydroxide (KOH) and ammonium sulfide (NH₄)₂S_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.