Reduced graphene oxide/single-walled carbon nanotube hybrid films using various p-type dopants and their application to gan-based light-emitting diodes

Byeong Ryong Lee, Tae Geun Kim

Research output: Contribution to journalArticle

Abstract

This article reports the electrical and optical properties of the reduced graphene oxide (RGO)/single-walled carbon nanotube (SWCNT) films using various p-type dopants and their application to GaN-based light-emitting diodes. To enhance the current injection and spreading of the RGO/SWCNT films on the light-emitting diodes (LEDs), we increased the work function (Φ) of the films using chemical doping with AuCl3, poly(3,4-ethylenedioxythiophene) oxidized with poly(4-styrenesulfonate) (PEDOT:PSS) and MoO3; thereby reduced the Schottky barrier height between the RGO/SWCNT films and p-GaN. By comparison, LEDs fabricated with work-function-tuned RGO/SWCNT film doped with MoO3 exhibited the decrease of the forward voltage from 5.3 V to 5.02 V at 20 mA and the increase of the output power up to 1.26 times. We also analyzed the current injection mechanism using ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy.

Original languageEnglish
Pages (from-to)454-459
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume17
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • GaN
  • Light-emitting diodes
  • Reduced graphene oxide
  • Single-walled carbon nanotube

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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