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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 1
BKCSDE 30(1)
January 20, 2009 

Synthesis of Amorphous Er3+-Yb3+ Co-doped TiO2 and Its Application
as a Scattering Layer for Dye-sensitized Solar Cells
Chi Hwan Han*, Hak Soo Lee, Kyung won Lee, Sang Do Han, Ishwar Singh
Dye-sensitized solar cell, Scattering layer, Er3+-Yb3+ co-doped titanium oxide, Amorphous structure
TiO2 doped with Er3+ and Yb3+ was used for fabricating a scattering layer and a nano-crystalline TiO2 electrode layer to be used in dye-sensitized solar cells. The material was prepared using a new sol-gel combustion hybrid method with acetylene black as fuel. The Er3+- Yb3+ co-doped titanium oxide powder synthesized at 700oC had embossed structure morphology with a size between 27 to 54 nm that agglomerated to produce micron size particles, as observed by the scanning electron micrographs. The XRD patterns showed that the Er3+- Yb3+ co-doped titanium oxide had an amorphous structure, while using the same method without doping Er3+ or Yb3+, TiO2 was obtained in the crystallite form with thea dominance of rutile phase. Fabricating a bilayer structure consisting of nano-crystalline TiO2 and the synthesized Er3+- Yb3+ co-doped titanium oxide showed better scattering property, with an overall increase of 15.6% in efficiency of the solar cell with respect to a single nano-crystalline TiO2 layer.
219 - 223
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