Electrochemical and hydrothermal deposition of ZnO on silicon: from continuous films to nanocrystals
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This article presents the study of the electrochemical deposition of zinc oxide from the non-aqueous solution based on dimethyl sulfoxide and zinc chloride into the porous silicon matrix. The features of the deposition process depending on the thickness of the porous silicon layer are presented. It is shown that after deposition process the porous silicon matrix is filled with zinc oxide nanocrystals with a diameter of 10–50 nm. The electrochemically deposited zinc oxide layers on top of porous silicon are shown to have a crystalline structure. It is also shown that zinc oxide crystals formed by hydrothermal method on the surface of electrochemically deposited zinc oxide film demonstrate ultra-violet luminescence. The effect of the porous silicon layer thickness on the morphology of the zinc oxide is shown. The structures obtained demonstrated two luminescence bands peaking at the 375 and 600 nm wavelengths. Possible applications of ZnO nanostructures, porous and continuous polycrystalline ZnO films such as gas sensors, light-emitting diodes, photovoltaic devices, and nanopiezo energy generators are considered. Aspects of integration with conventional silicon technology are also discussed.
KeywordsZinc oxide Porous silicon Nanocrystal X-ray diffraction Photoluminescence
The study has been supported by Belarus Government Research Program “Nanomaterials and nanotechnologies”, grant 6.12.03 and by the Italian company Rise Technology S.r.l. Authors would like to thank V. Tzibulsky from “Belmicrosystems” (Minsk, Belarus) for help in SEM images preparation, A. Puskarev, L. Postnova and V. Levchenko from “Scientific-Practical Materials Research Centre of NAS of Belarus” SSPA for their help in XRD investigations, and V. Yakovtseva and R. Crescenzi respectively from Belarusian State University of Informatics and Radioelectronics and University of Rome “La Sapienza”, Electronic Department for the fruitful discussion, and also O. Kozlova and A. Yermalovich for their help in experiments implementation.
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