TY - JOUR
T1 - Effect of hydrogen pretreatment combined with growth temperature on the morphologies of ZnO nanostructures
T2 - Structural and optical properties
AU - Umar, A.
AU - Kim, S. H.
AU - Suh, E. K.
AU - Hahn, Y. B.
N1 - Funding Information:
This work was supported by the Korea Science and Engineering Foundation grant funded by Korean Government, (MOST) (R01-2006-000-11306-0). Authors also wish to thanks Mr. T. S. Bae and J. C. Lim, KBSI, Jeonju branch, and Mr. Kang, Centre for University Research Facility for taking good quality SEM and TEM images, respectively.
PY - 2007/8/1
Y1 - 2007/8/1
N2 - Morphological evolution in ZnO nanostructures has been observed by varying the temperature and pretreatment step on silicon substrate. The ZnO nanostructures were grown by the thermal evaporation of high-purity metallic zinc powder in the presence of oxygen without the use of any catalyst or additives. The local substrate temperature, pretreatment step, and distance of the substrate from the source material showed a great effect on the morphologies of the deposited structures. Therefore, specific structures were obtained at specific temperature zones at particular distances from the source material with or without pretreatment step. Detailed structural investigations demonstrated that the deposited nanostructures are single crystalline with the wurtzite hexagonal phase. Raman-scattering and room-temperature photoluminescence spectra reflect the high purity and almost defect free quality with good optical properties for all the as-grown products.
AB - Morphological evolution in ZnO nanostructures has been observed by varying the temperature and pretreatment step on silicon substrate. The ZnO nanostructures were grown by the thermal evaporation of high-purity metallic zinc powder in the presence of oxygen without the use of any catalyst or additives. The local substrate temperature, pretreatment step, and distance of the substrate from the source material showed a great effect on the morphologies of the deposited structures. Therefore, specific structures were obtained at specific temperature zones at particular distances from the source material with or without pretreatment step. Detailed structural investigations demonstrated that the deposited nanostructures are single crystalline with the wurtzite hexagonal phase. Raman-scattering and room-temperature photoluminescence spectra reflect the high purity and almost defect free quality with good optical properties for all the as-grown products.
KW - A1. Nanostructure
KW - A1. Optical characterization
KW - A2. Vapor-solid mechanism
KW - B1. ZnO
KW - B2. Semiconducting II-VI materials
UR - http://www.scopus.com/inward/record.url?scp=34447537960&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2007.04.054
DO - 10.1016/j.jcrysgro.2007.04.054
M3 - Article
AN - SCOPUS:34447537960
SN - 0022-0248
VL - 306
SP - 52
EP - 61
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -