Effect of HfO2 passivation layer on light extraction efficiency of AlInN nanowire ultraviolet light-emitting diodes

Moulik Patel, Barsha Jain, Ravi Teja Velpula, Hieu Pham Trung Nguyen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One of the probable reasons behind the limitation of light extraction efficiency (LEE) in III-nitride nanowire (NW) deep ultraviolet (UV) light-emitting diodes (LEDs) is the presence of the high surface density states that significantly contribute to the non-radiative recombination near the surface. Herein, we investigate the LEE of a single AlInN NW UV LED in the entire UV wavelength regime using finite-difference time-domain simulations. It is found that these LEDs favor transverse-magnetic (TM) polarized LEE over transverse-electric (TE) polarized emission. Further, we examine the role of the HfO2 surface passivation layer in the improvement of LEE of AlInN NW LED at ~282 nm wavelength. Our results show that the TM-polarized LEE of such LED without any passivation is only ~25.2%, whereas the maximum recorded LEE is ~40.6% with the utilization of 40 nm HfO2 passivation layer. This study provides a promising approach for enhancing the LEE of NW UV LEDs.

Original languageEnglish (US)
Title of host publication239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Wide Bandgap Semiconductor Materials and Devices 22
EditorsV. Chakrapani, J. K. Hite, J. Zavada, T. Anderson, M. Tadjer, S. H. Kilgore
PublisherIOP Publishing Ltd.
Pages35-42
Number of pages8
Edition3
ISBN (Electronic)9781607685395
DOIs
StatePublished - 2021
Event239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021 - Chicago, United States
Duration: May 30 2021Jun 3 2021

Publication series

NameECS Transactions
Number3
Volume102
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference239th ECS Meeting with the 18th International Meeting on Chemical Sensors, IMCS 2021
Country/TerritoryUnited States
CityChicago
Period5/30/216/3/21

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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