Abstract
ZnSe -core/ SnO2 -shell nanorods have been prepared by using a two-step process comprising the thermal evaporation of ZnSe powders and the atomic layer deposition of SnO2 . ZnSe nanorods have been grown by the thermal evaporation of ZnSe powders on gold-coated Al2O3 (0001) substrates. The ZnSe -core/ SnO2 -shell nanorods were 0.1–0.2 μm in diameter and up to a few tens of micrometers in length. Transmission electron microscopy and X-ray diffraction analysis results indicate that the cores and shells are single crystal zinc blende-type ZnSe and polycrystalline simple orthorhombic-type SnO2 , respectively. Photoluminescence measurements show that the ZnSe -core/ SnO2 -shell nanorods have a strong orange emission band centered at around 650 nm. The orange emission of the ZnSe nanorods is enhanced in intensity by coating them with SnO2 and further enhanced by annealing them. A reducing atmosphere is more efficient in enhancing the orange emission than an oxidative atmosphere. The highest emission intensity is obtained for the shell layer thickness corresponding to 1500 ALD cycles. The orange emission enhancement by annealing is mainly attributed to the formation of Sn interstitials in the ZnSe cores during the annealing process.
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