Catalyst-free GaN nanorods grown by metalorganic molecular beam epitaxy

Shou Yi Kuo*, C. C. Kei, Chien Nan Hsiao, C. K. Chao, Fang I. Lai, Hao-Chung Kuo, Wen Feng Hsieh, Shing Chung Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

High-density GaN nanorods with outstanding crystal quality were grown on c-sapphire substrates by radio-frequency plasma-assisted metalorganic molecular beam epitaxy under catalyst- and template-free growth condition. Morphological and structural characterization of the GaN nanorods was employed by X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy (HRTEM). These results indicate that the rod number density can reach 1 × 1010 cm -2 and the nanorods are well-aligned with preferentially oriented in the c-axis direction. Meanwhile, no metallic (Ga) droplet was observed at the end of the rods, which is the intrinsic feature of vapor-liquid-solid method. Nanorods with no traces of any extended defects, as confirmed by TEM, were obtained as well. In addition, optical investigation was carried out by temperature- and power-dependent micro-photoluminescence (μ-PL). The PL peak energies are red-shifted with increasing excitation power, which is attributed to many-body effects of free carriers under high excitation intensity. The growth mechanism is discussed on the basis of the experimental results. Catalyst-free GaN nanorods presented here might have a high potential for applications in nanoscale photonic devices.

Original languageEnglish
Pages (from-to)273-276
Number of pages4
JournalIEEE Transactions on Nanotechnology
Volume5
Issue number3
DOIs
StatePublished - 1 May 2006

Keywords

  • Catalyst free
  • GaN nanorod
  • Metalorganic molecular-beam epitaxy
  • Nanotechnology

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    Kuo, S. Y., Kei, C. C., Hsiao, C. N., Chao, C. K., Lai, F. I., Kuo, H-C., Hsieh, W. F., & Wang, S. C. (2006). Catalyst-free GaN nanorods grown by metalorganic molecular beam epitaxy. IEEE Transactions on Nanotechnology, 5(3), 273-276. https://doi.org/10.1109/TNANO.2006.874055