Niobium-Doped (001)-Dominated Anatase TiO2 Nanosheets as Photoelectrode for Efficient Dye-Sensitized Solar Cells

Lei Jiang, Lei Sun, Dong Yang, Jian Zhang, Ya Juan Li, Kun Zou, Wei Qiao Deng

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

TiO2 nanocrystals with different reactive facets have attracted extensive interest since they were first synthesized. The anatase TiO2 nanocrystals with (001) or (100) dominate facets were considered to be excellent electrode materials to enhance the cell performance of dye-sensitized solar cells. However, which reactive facet presents the best surface for benefiting photovoltaic effect is still unknown. We report a systematic study of various anatase TiO2 surfaces interacting with N719 dye by means of density functional theory calculations in combination with microscopic techniques. The (001) surface interacting with N719 would have the lowest work function, leading to the best photovoltaic performances. To further increase the efficiency, Nb dopant was incorporated into the anatase TiO2 nanocrystals. Based on the theoretical prediction, we proposed and demonstrated novel Nb-doped (001)-dominated anatase TiO2 nanosheets as photoelectrode in a dye-sensitized solar cell to further enhance the open-circuit voltage. And a power conversion efficiency of 10% was achieved, which was 22% higher than that of the undoped device (P25 as an electrode).

Original languageEnglish (US)
Pages (from-to)9576-9583
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number11
DOIs
StatePublished - Mar 22 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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