Research Article
Enhanced Photovoltaic Properties of Dye-Sensitized Solar Cells through Ammonium Hydroxide-Modified (Nitrogen-Doped) Titania Photoanodes
Figure 2
(a) XPS spectrum of 20N-TiO2 and (b, c) high-resolution XPS spectra of Ti 2p, O 1s, and N 1s.
| (a) |
| (b) |
| (c) |
| (d) |