On the Physical Properties of Radial ZnO-core/ZnS-shell Nanostructures Deposited at Atmospheric Pressure Using DEZn, N2o and Dtbs
溫盛文1, 黃柏豪1, 賴慧婷1, 侯景翔1*, 龔志榮1, 林泰源2
1物理所, 中興大學, 台中市, Taiwan
2光電科學研究所, 海洋大學, 基隆, Taiwan
* presenting author:Ching-Hsiang Hou, email:jrgong@phys.nchu.edu.tw
Radial ZnO-core/ZnS-shell nanostructures were deposited at atmospheric pressure by atomic layer deposition (ALD) using diethylzinc (DEZn), nitrous oxide (N2O) and ditert-butylsulfide (DTBS) precursors. The structural and optical properties of radial ZnO-core/ZnS-shell nanostructures were characterized using θ-2θX-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and photoluminescence spectroscopy (PL).

Both ZnO-core and ZnS-shell of the ALD-deposited radial ZnO-core/ZnS-shell nanostructure were found wurtzite in nature based upon the results of HRTEM investigations. Moire fringes were identified in the radial ZnO-core/ZnS-shell nanowire structure with an observed period being in good agreement with the lattice mismatch between ZnO-core and ZnS-shell of the pseudomorphic ZnO-core/ZnS-shell nanostructure.

Strong neutral donor excitonic emissions (DoX) along with related longitudinal optical phonon (LO) replicas of ZnO cores were observed in the 10K PL of the ALD-deposited radial ZnO-core/ZnS-shell nanostructures. It appears that the ALD-deposited radial ZnO-core/ZnS-shell nanostructures exhibit high structural and optical quality.

Keywords: Atomic layer deposition, Zinc oxides, X-ray diffraction, Crystal structure