Nanostructured Nitrogen Doping TiO Nanomaterials for Photoanodes of Dye-Sensitized Solar Cells - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 66

Fig. 8 Surface photovoltage spectra: a bare N-doped and undoped ST-01 electrodes and b after
N719-sensitization [ 55 ]
Fig. 9 V OC versus Q SC
(N-A: N-doped DSCs) [ 56 ]
which remained at nearly at 80 % compared with the 72 % of the undoped DSC at
70 C over 1,000 h [ 44 ].
Further investigation on the effect of N-doped TiO 2 on the deterioration of the
dye was also performed [ 55 ]. The dye stability tests consisted of examining the
dyes adsorbed on the N-doped TiO 2 films and the photoanodes of the solar cells. In
Fig. 11 a, compared with UV-Vis absorption spectra of fresh N719, the dyes des-
orbed from N-doped and undoped TiO 2 film were destroyed but to a similar extent.
In Fig. 11 b, the absorption of fresh dye is almost the same with those in N-doped
and undoped TiO 2 photoanodes. These results indicate that N-doped TiO 2 did not
accelerate the dye deteriorations.
3.5 Application of N-doped TiO 2 Photoanodes into QDSCs
Except for DSCs, N-doped TiO 2 nanomaterials were also applied into quantum-dot
sensitized solar cells (QDSCs).