Zinc-doping in TiO2 films to enhance electron transport in dye-sensitized solar cells under low-intensity illumination

Kai Ping Wang, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

164 Citations (Scopus)

Abstract

A nanocrystalline TiO2 film with highly dispersed Zn-doping shows its capability for efficient electron transport in dye-sensitized solar cells (DSSCs). The Zn-doping is conducted via Zn2+ introduction into a layered titanate followed by hydrothermal treatment and calcination. The Zn-doped films exhibit an elevated electron Fermi level, which may enhance band bending to lower the density of empty trap states. Because of this Zn-doping, the consequent DSSCs can alleviate the decay of light-to-electric energy conversion efficiency due to light intensity reduction. Intensity-modulated spectroscopic analysis reveals that enhanced transport of photogenerated electrons as a result of the trap density minimization is responsible for the high cell performance under low-intensity illumination. A Zn-doping content of ca. 0.4 at% Zn/Ti can enhance the light conversion efficiency by 23% at a solar light intensity as low as 11 mW cm-2. This technique can significantly extend the indoor application of DSSCs.

Original languageEnglish
Pages (from-to)9489-9496
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume11
Issue number41
DOIs
Publication statusPublished - 2009 Oct 22

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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