Characterization of InN epilayers grown on Si(1 1 1) substrates at various temperatures by MBE

Yan Hsin Wang, Wei Li Chen, Ming Fei Chen

研究成果: Article

6 引文 斯高帕斯(Scopus)

摘要

InN films have been grown by plasma-assisted molecular beam epitaxy (PAMBE) and characterized by various technologies. It was found that the structural, optical and electrical properties can be drastically improved by raising growth temperature from 440 to 525 °C. Grainy morphology was found in the grain size was found in atomic force microscope images. The large grain size was about 360 nm for a film grown at 525 °C. These films exhibited Wurtzite structure with a c/a ratio ranging from 1.59 to 1.609. The dislocation densities estimated by X-ray diffraction techniques closely agreed with those analyzed by plan-view transmission electron microscopy. Photoluminescence (PL) studies confirmed near band-to-band transitions and the narrowest low-temperature PL peak width was found to be 24 meV at 0.666 eV. Carrier concentrations decreased from 1.44×1019 to 1.66×1018 cm-3 and Hall mobility increased from 226 to 946 cm2 V-1 s-1 as the growth temperature is progressively increased from 440 to 525 °C. Raman spectra also indicated improved crystal quality as the growth temperature was raised.

原文English
頁(從 - 到)1746-1751
頁數6
期刊Physica E: Low-Dimensional Systems and Nanostructures
41
發行號10
DOIs
出版狀態Published - 2009 十月 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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