Ultrafast carrier dynamics in GaN/InGaN multiple quantum wells nanorods

Weijian Chen, Xiaoming Wen, Michael Latzel, Jianfeng Yang, Shujuan Huang, Santosh Shrestha, Robert Patterson, Silke Christiansen, Gavin Conibeer

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

Abstract

GaN/InGaN multiple quantum wells (MQW) is a promising material for high-efficiency solid-state lighting. Ultrafast optical pump-probe spectroscopy is an important characterization technique for examining fundamental phenomena in semiconductor nanostructure with sub-picosecond resolution. In this study, ultrafast exciton and charge carrier dynamics in GaN/InGaN MQW planar layer and nanorod are investigated using femtosecond transient absorption (TA) techniques at room temperature. Here nanorods are fabricated by etching the GaN/InGaN MQW planar layers using nanosphere lithography and reactive ion etching. Photoluminescence efficiency of the nanorods have been proved to be much higher than that of the planar layers, but the mechanism of the nanorod structure improvement of PL efficiency is not adequately studied. By comparing the TA profile of the GaN/InGaN MQW planar layers and nanorods, the impact of surface states and nanorods lateral confinement in the ultrafast carrier dynamics of GaN/InGaN MQW is revealed. The nanorod sidewall surface states have a strong influence on the InGaN quantum well carrier dynamics. The ultrafast relaxation processes studied in this GaN/InGaN MQW nanostructure is essential for further optimization of device application.

Original languageEnglish
Title of host publicationNanophotonics Australasia 2017
EditorsJames W. M. Chon, Baohua Jia
Place of PublicationBellingham, WA
PublisherSPIE
Pages1-6
Number of pages6
ISBN (Electronic)9781510613942
ISBN (Print)9781510613935
DOIs
Publication statusPublished - 2018
Externally publishedYes
EventNanophotonics Australasia 2017 - Melbourne, Australia
Duration: 10 Dec 201713 Dec 2017

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume10456
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNanophotonics Australasia 2017
CountryAustralia
CityMelbourne
Period10/12/1713/12/17

Keywords

  • Ultrafast carrier dynamics
  • multiple quantum wells
  • GaN
  • transient absorption
  • nanorod

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