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faster electron transport contributed to the enhanced performance of N-doped
DSCs. Therefore, N-doped TiO
2
nanomaterials are good semiconductor candidates
for highly efficient photoanodes of DSCs. The application of N-doped TiO
2
is also
widely extended into photocatalysis and other areas.
The fundamental research on how nitrogen doping enhances the charge trans-
port and photovoltaic performance is still needed. Besides, the controlling of
nanostructure and doping process of N-doped TiO
2
is an interesting topic in the
future.
Acknowledgements This work was supported by NSFC (Grant No. 50773008) and State Key
Laboratory of New Ceramic and Fine Processing (Tsinghua University). This work was also
supported by the National High Technology Research and Development Program for Advanced
Materials of China (Grant No. 2009AA03Z220).
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