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Hole transport in sensitized CdS–NiO nanoparticle photocathodes
Kang, Soon Hyung,Zhu, Kai,Neale, Nathan R.,Frank, Arthur J. Royal Society of Chemistry 2011 Chemical communications Vol.47 No.37
<P>A general chemical approach was used to synthesise NiO–CdS core–shell nanoparticle films as photocathodes for p-type semiconductor-sensitized solar cells. Compared to dye-sensitized NiO photocathodes, the CdS-sensitized NiO cathodes exhibited two orders of magnitude faster hole transport (attributable to the passivation of surface traps by the CdS) and almost 100% charge-collection efficiencies.</P> <P>Graphic Abstract</P><P>NiO–CdS core–shell nanocrystalline photocathodes display almost 100% charge-collection efficiencies and two orders of magnitude faster hole transport than the dye-sensitized NiO photocathodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc13932k'> </P>
Transparent TiO2 nanotube array photoelectrodes prepared via two-step anodization
Kim Jin Young,Zhu Kai,Neale Nathan R,Frank Arthur J 나노기술연구협의회 2014 Nano Convergence Vol.1 No.9
Two-step anodization of transparent TiO2 nanotube arrays has been demonstrated with aid of a Nb-doped TiO2 buffer layer deposited between the Ti layer and TCO substrate. Enhanced physical adhesion and electrochemical stability provided by the buffer layer has been found to be important for successful implementation of the two-step anodization process. With the proposed approach, the morphology and thickness of NT arrays could be controlled very precisely, which in turn, influenced their optical and photoelectrochemical properties.
Lee, Sang-Wha,Ahn, Kwang-Soon,Zhu, Kai,Neale, Nathan R.,Frank, Arthur J. American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.40
<P>We report on the effects of treating TiO<SUB>2</SUB> nanocrystalline films with different concentrations of TiCl<SUB>4</SUB> (5–500 mM) on the film morphology, charge-carrier dynamics, and performance of dye-sensitized solar cells. Transport and recombination in the TiCl<SUB>4</SUB>-treated films were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopies. These studies showed that, at a low TiCl<SUB>4</SUB> concentration (5 mM), the electron diffusion coefficient in the annealed film increased. At intermediate TiCl<SUB>4</SUB> concentrations (15–50 mM), the surface area of the films increased, resulting in an increase of light harvesting and overall power conversion efficiency. At a high TiCl<SUB>4</SUB> concentration (500 mM), light scattering in the film in the long wavelength region of the visible spectrum was enhanced, but the averaged pore size of the film became narrower, resulting in slower transport and loss of cell performance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-40/jp3079887/production/images/medium/jp-2012-079887_0007.gif'></P>