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Control of morphology and Orientation of Electrochemically Grown ZnO Nanorods
Tran Hoang Cao Son,Le Khac Top,Nguyen Thi Dong Tri,Ha Thuc Chi Nhan,Lam Quang Vinh,Bach Thang Phan,김상섭,Le Van Hieu 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.2
We report the direct electrochemical deposition of ZnO nanorods on an indium tin oxide substrate. Themorphology and orientation of the grown ZnO nanorods were investigated as functions of the currentdensity. It is likely that the concentrations of OH- and Zn2+ ions, which could be controlled by varying thecurrent density, determine the shape and alignment of the ZnO nanorods. The nanorods were tilted, hexagonal,and prismatic at a low current density (0.1 mA/cm2) and vertically aligned and obelisk-shaped at highcurrent densities (greater than 0.6 mA/cm2). By using the low and high current densities sequentially in atwo-step growth process, vertically aligned, hexagonal, and prismatic ZnO nanorods could be grownsuccessfully. The underlying mechanism responsible for the growth of the ZnO nanorods is also discussed.
Effect of precursors on Cu2S counter electrode on the quantum dot sensitized solar cell performance
Phuong Ho Nhat,Van Man Tran,Tung Ha Thanh,Jun H. K.,Van Thang Bui,Vinh Lam Quang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.12
Counter electrode of Cu2S on fuorine-doped tin oxide glass, which was synthesized by chemical bath deposition method in a nitrogen-purged environment with varying precursors and temperatures, is used for quantum dot sensitized solar cell fabrication. The morphology, composition and crystalline structure of the Cu2S flm were characterized by scanning electron microscopy, energy dispersive X-ray and X-ray difraction analysis. Electrochemical properties of the Cu2S flm were measured by cyclic voltammetry measurement and the highest performance of JSC=18.2 mA/cm2 , VOC=0.57 V, FF=0.38 and η=3.94% were recorded in the cell fabricated by the mixture of CuSO4 and Na2S2O3 precursors (1.0/1.0 ratio). It is the result of the enhancement of electrocatalytic activity, charge transfer and collection, and excited electron lifetime.