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Nikolay, Tsvetkov,Larina, Liudmila,Shevaleevskiy, Oleg,Ahn, Byung Tae Royal Society of Chemistry 2011 ENERGY AND ENVIRONMENTAL SCIENCE Vol.4 No.4
<P>To improve the conversion efficiency of dye-sensitized solar cells (DSSCs) it is necessary to understand the electronic structure of the TiO<SUB>2</SUB>–dye–electrolyte interface in detail. A sturdy junction at the interface can be provided by modifying the electronic structure of the TiO<SUB>2</SUB> electrode with Nb doping. The Nb-doped TiO<SUB>2</SUB> was prepared by a sol–gel method followed by a hydrothermal treatment; the Nb content was varied from 0.5 to 3.0 mol%. The X-ray photoelectron spectroscopy showed that the Fermi level of TiO<SUB>2</SUB> electrode shifted away from the conduction band minimum (CBM) when the Nb content is low (≤1.5 mol%) and shifted toward the CBM when the Nb content is high (≥2.5 mol%). The shift of Fermi level with low Nb doping was due to the passivation of the oxygen vacancies at the TiO<SUB>2</SUB> nanoparticle surface. Intraband states were formed when dopant content was 1.5 and 2.5 mol%. We have found that the photovoltaic parameters of DSSCs based on doped TiO<SUB>2</SUB> sensitized with a <I>cis</I>-[Ru(dcbpyH)<SUB>2</SUB>(NCS)<SUB>2</SUB>](NBu<SUB>4</SUB>)<SUB>2</SUB>, N719 dye, are closely related to the electronic structure of the Nb-doped TiO<SUB>2</SUB> electrode. The changes of short circuit current and open circuit voltage of DSSCs were explained in relation to the electronic structure of the TiO<SUB>2</SUB> electrode. The best efficiency of 8.0% was demonstrated by DSSCs with 2.5 mol% Nb-doped TiO<SUB>2</SUB>.</P> <P>Graphic Abstract</P><P>Lightly Nb-doped TiO<SUB>2</SUB> electrodes with improved electronic structure were fabricated and used as photoanodes for dye sensitized solar cells with increased performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0ee00678e'> </P>