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Study on the structural and physical properties of ZnO nanowire arrays grown via electrochemical and hydrothermal depositions

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5 Author(s)
Laurent, K. ; Université Paris-Est, LPMDI, CNRS-FRE 3300, 5 bd. Descartes, 77454 Marne la Vallée Cedex 2, France ; Brouri, T. ; Capo-Chichi, M. ; Yu, D. P.
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We report here the systematic study of well controlled ZnO nanowire arrays grown via two different chemical ways: electrodeposition and hydrothermal method, which are frequently used for low cost synthesis of ZnO nanowire arrays. Both methods consist of two elaboration steps: a seed layer ZnO was first deposited on the substrate and then the growth of the ZnO nanowire arrays on the seed layer was performed. Scanning electron microscopy observations show a similar morphology, while x-ray diffraction (XRD) and Raman spectra revealed a preferred orientation of ZnO nanowires towards the c-axis. High resolution transmission electron microscopy analysis showed excellent monocrystallinity of the nanowire. A p-n junction structure based on above two kinds of nanowire arrays with a p-CuSCN layer was fabricated and their photoluminescence (PL) and conductance were measured in comparison. PL measurements demonstrated a higher defects concentration in ZnO nanowires obtained by hydrothermal method which leads to a very high current in the corresponding p-n junction with the p-CuSCN layer. This property is very important in prospective to future applications such as photovoltaic cell, nanogenerator, or gas sensor.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 9 )

Date of Publication:

Nov 2011

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