Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/72954
Title: Surface and optical properties of nanocrystalline GaN thin films on sapphire (0001) by pulsed laser deposition
Authors: Ni, H.Q.
Lu, Y.F. 
Teng, J.H.
Jie, Y.X. 
Mai, Z.H.
Ren, Z.M.
Issue Date: 1999
Source: Ni, H.Q.,Lu, Y.F.,Teng, J.H.,Jie, Y.X.,Mai, Z.H.,Ren, Z.M. (1999). Surface and optical properties of nanocrystalline GaN thin films on sapphire (0001) by pulsed laser deposition. Proceedings of SPIE - The International Society for Optical Engineering 3898 : 224-231. ScholarBank@NUS Repository.
Abstract: GaN thin films have been grown on sapphire (0001) substrates by pulsed laser deposition. The thin films deposited at different substrate temperature have been evaluated by X-ray diffraction (XRD), photoluminescence spectroscopy (PL), and X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM). The influences of depositing temperature on surface and optical properties of the GaN thin films have been studied. The XRD results show that the lowest full width at half maximum (FWHM) of (0002) X-ray diffraction line of the GaN film was deposited at about 700 °C. The photoluminescence (PL) spectra were measured at 7 K. The quantum confinement effects of the nanocrystalline GaN films have been evaluated by the band edge PL peaks. The energy shift of the band edge PL peaks of GaN film deposited at 700 °C have been estimated by the effective mass approximation method. The chemical composition and the native oxide of the GaN film surface were investigated by the XPS spectra. Average roughness and surface morphology of the GaN thin films deposited on the sapphire (0001) substrates have been evaluated by AFM.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/72954
ISSN: 0277786X
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

22
checked on Dec 9, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.