A simple low temperature synthesis route for ZnO-MgO core-shell nanowires.

نویسندگان

  • N O V Plank
  • H J Snaith
  • C Ducati
  • J S Bendall
  • L Schmidt-Mende
  • M E Welland
چکیده

We report a hydrothermal synthesis method for MgO shell coatings directly onto the surface of ZnO nanowire arrays. The entire process can be carried out below 100 °C. The MgO shells are produced by the addition of 10 mM magnesium nitrate with 0.2 M sodium hydroxide in water, resulting in a shell thickness of up to 8 nm, verified by high resolution transmission electron microscopy. The viability of the MgO layer as a functional element of optoelectronic devices was tested on solid-state organic hole-transporter based dye-sensitized solar cells. Incorporation of the MgO shell into the solar cell resulted in substantive efficiency improvements of over 400% in comparison to the pristine ZnO nanowire based photovoltaics, indicating that electrons can efficiently tunnel through the 'insulating' MgO shell.

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عنوان ژورنال:
  • Nanotechnology

دوره 19 46  شماره 

صفحات  -

تاریخ انتشار 2008