Self-catalyzed epitaxial growth of vertical indium phosphide nanowires on silicon

Nano Lett. 2009 Jun;9(6):2223-8. doi: 10.1021/nl803567v.

Abstract

Vertical indium phosphide nanowires have been grown epitaxially on silicon (111) by metalorganic vapor-phase epitaxy. Liquid indium droplets were formed in situ and used to catalyze deposition. For growth at 350 degrees C, about 70% of the wires were vertical, while the remaining ones were distributed in the 3 other <111> directions. The vertical fraction, growth rate, and tapering of the wires increased with temperature and V/III ratio. At 370 degrees C and V/III equal to 200, 100% of the wires were vertical with a density of approximately 1.0 x 10(9) cm(-2) and average dimensions of 3.9 mum in length, 45 nm in base width, and 15 nm in tip width. X-ray diffraction and transmission electron microscopy revealed that the wires were single-crystal zinc blende, although they contained a high density of rotational twins perpendicular to the <111> growth direction. The room temperature photoluminescence spectrum exhibited one peak centered at 912 +/- 10 nm with a FWHM of approximately 60 nm.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Indium / chemistry*
  • Microscopy, Electron, Transmission
  • Nanowires / chemistry*
  • Nanowires / ultrastructure
  • Phosphines / chemistry*
  • Silicon / chemistry*
  • X-Ray Diffraction

Substances

  • Phosphines
  • Indium
  • indium phosphide
  • Silicon