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Juan Sun, Cheng Sun, Sudip K. Batabyal, Phong D. Tran, Stevin S. Pramana, Lydia H. Wong, Subodh G. Mhaisalkar
Electrochemistry Communications Volume 15, Issue 1, February 2012
Abstract
Directed electrochemical assemblies were adopted to fabricate CuInSe2/SnO2 core-shell and hierarchical branched nanostructures. Authors observed that by changing the spatial electric field along the deposition region, the morphology and stoichiometry of deposited product can controlled. It is possible to fabricate form in-poor-CuInSe2 nanoparticles decorated SnO2 nanowire to near stoichiometry CuInSe2 branched nanowires by depositing CuInSe2 on SnO2 nanowire. A combination of FESEM, TEM, XRD and Raman spectroscopy investigations reveal that the morphology and chemical compositions of the final product depends on the spatial electric field distribution on the SnO2/Si substrate. Author observed that higher reducing potential at the cathode side can assist the formation of CuInSe2 with uniform coverage, but on the anode side only In-poor-CuInSe2 nanoparticles is formed. The potentiality of these hierarchical structures for solar energy harvesting was found by optical and photo-electrochemical examination.
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