Microtube Light-Emitting Diode Arrays with Metal Cores

Youngbin Tchoe, Chul-Ho Lee, Jun Beom Park, Hyeonjun Baek, Kunook Chung, Janghyun Jo, Miyoung Kim, Gyu Chul Yi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We report the fabrication and characteristics of vertical microtube light-emitting diode (LED) arrays with a metal core inside the devices. To make the LEDs, gallium nitride (GaN)/indium gallium nitride (InxGa1-xN)/zinc oxide (ZnO) coaxial microtube LED arrays were grown on an n-GaN/c-aluminum oxide (Al2O3) substrate. The microtube LED arrays were then lifted-off the substrate by wet chemical etching of the sacrificial ZnO microtubes and the silicon dioxide (SiO2) layer. The chemically lifted-off LED layer was then transferred upside-down on other supporting substrates. To create the metal cores, titanium/gold and indium tin oxide were deposited on the inner shells of the microtubes, forming n-type electrodes inside the metal-cored LEDs. The characteristics of the resulting devices were determined by measuring electroluminescence and current-voltage characteristic curves. To gain insights into the current-spreading characteristics of the devices and understand how to make them more efficient, we modeled them computationally.

Original languageEnglish
Pages (from-to)3114-3120
Number of pages7
JournalACS Nano
Volume10
Issue number3
DOIs
Publication statusPublished - 2016 Mar 22

Keywords

  • current spreading
  • gallium nitride
  • light-emitting diodes
  • metal core
  • nanoarchitecture

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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  • Cite this

    Tchoe, Y., Lee, C-H., Park, J. B., Baek, H., Chung, K., Jo, J., Kim, M., & Yi, G. C. (2016). Microtube Light-Emitting Diode Arrays with Metal Cores. ACS Nano, 10(3), 3114-3120. https://doi.org/10.1021/acsnano.5b07905