Nanostructured Nitrogen Doping TiO Nanomaterials for Photoanodes of Dye-Sensitized Solar Cells - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 67

Fig. 10 Long-term stability of the DSCs based on TiO 2-x N x electrode [ 23 ]

Fig. 11 UV-Vis absorption spectra of a fresh N19 dye and the dyes desorbed from N-doped and
undoped ST-01 films; b fresh N19 dye and the N719 dye desorbed from N-doped and undoped
DSCs devices [ 55 ]

Zhang et al. combined N-doped TiO 2 and CdSe QDs to assemble QDSCs.
Compared with QDSCs using pristine TiO 2 , the photocurrent of CdSe-sensitized
N-doped TiO 2 QDSCs was significantly enhanced. They ascribed this photocurrent
enhancement to the extra pathways for charge transfer introduced by nitrogen
doping (Fig. 12 )[ 65 ]. Kang et al. reported the hierarchical N-doped TiO 2 nano-
clumps as photoanodes of CdSe-sensitized QDSCs. They found that the perfor-
mance of QDSCs was improved by 145 % when using N-ion doping of TiO 2
photoanodes. One of the two explanations about the significant improvement of
QDSCs was the increased recombination resistance at TiO 2 /QDs/electrolyte
interface, which was caused by the decreased surface states and oxygen vacancies
after nitrogen doping in TiO 2 [ 47 ].