Violet light-emitting diodes grown on crack-free AlGaN templates

Tong Wen Wang, Nie Chuan Chen, Wei Chieh Lien, Meng Chyi Wu, Chuan Feng Shih

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This study investigates the violet light-emitting diodes (LEDs) grown on crack-free AlGaN templates, which were prepared on GaN and AlN nucleation layers (NLs) over sapphire substrates by metal-organic chemical-vapor deposition using a two-step growth method. Symmetric and asymmetric x-ray diffraction patterns show that the LED structure grown on the AlGaN template with a GaN NL exhibits a better crystalline quality as compared to that with an AlN NL. When observed from the analyses of secondary-ion-mass spectroscopy and transmission-electron microscopy, it is found that the thickness and the indium composition in the InGaN wells of InGaN/GaN multiquantum wells are slightly different at the growth temperatures of 720 and 750 °C. In addition, the LEDs with GaN NL exhibit a narrower full width at half maximum of the excitonic peaks than those with AlN NL.

Original languageEnglish
Pages (from-to)1881-1885
Number of pages5
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume27
Issue number4
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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