Photoluminescence studies of ZnO thin films on R-plane sapphire substrates grown by sol-gel method

Title
Photoluminescence studies of ZnO thin films on R-plane sapphire substrates grown by sol-gel method
Author(s)
김종수Min Su Kim[Min Su Kim]GiWoong Nam[GiWoong Nam]Soaram Kim[Soaram Kim]Do Yeob Kim[Do Yeob Kim]Jin Soo Kim[Jin Soo Kim]Sung-O Kim[Sung-O Kim]Jeong-Sik Son[Jeong-Sik Son]Dong-Yul Lee[Dong-Yul Lee]Jae-Young Leem[Jae-Young Leem]
Keywords
ROOM-TEMPERATURE PHOTOLUMINESCENCE; CHEMICAL-VAPOR-DEPOSITION; ZINC-OXIDE; LUMINESCENCE; EXCITONS
Issue Date
201210
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF LUMINESCENCE, v.132, no.10, pp.2581 - 2585
Abstract
Zinc oxide (ZnO) thin films on R-plane sapphire substrates were grown by the sol-gel spin-coating method. The optical properties of the ZnO thin films were investigated using photoluminescence. In the UV range, the asymmetric near-band-edge emission was observed at 300 K, which consisted of two emissions at 3.338 and 3.279 eV. Eight peaks at 3.418, 3.402, 3.360, 3.288, 3.216, 3.145, 3.074, and 3.004 eV, which respectively correspond to the free exciton (FX), bound exciton, transverse optical (TO) phonon replica of FX recombination, and first-order longitudinal optical phonon replica of FX and the TO (1LO+TO), 2LO+TO, 3LO+TO, 4LO+TO, and 5LO+TO, were obtained at 12 K. From the temperature-dependent PL, it was found that the emission peaks at 3.338 and 3.279 eV corresponded to the FX and TO, respectively. The activation energy of the FX and TO emission peaks was found to be about 39.3 and 28.9 meV, respectively. The values of the fitting parameters of Varshni's empirical equation were alpha=4 x 10(-3) eV/K and beta=4.9 x 10(3) K, and the S factor of the ZnO thin films was 0.658. With increasing temperature, the exciton radiative lifetime of the FX and TO emissions increased. The temperature-dependent variation of the exciton radiative lifetime for the TO emission was slightly higher than that for the FX emission. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/27088http://dx.doi.org/10.1016/j.jlumin.2012.05.010
ISSN
0022-2313
Appears in Collections:
이과대학 > 물리학과 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

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

BROWSE