Hybrid titania photoanodes with a nanostructured multi-layer configuration for highly efficient dye-sensitized solar cells

Hui Ping Wu, Chi Ming Lan, Jyun Yu Hu, Wei Kai Huang, Jia Wei Shiu, Zih Jian Lan, Cheng Ming Tsai, Chun Hsien Su, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

To construct a hybrid titania photoanode containing nanoparticles and nanorods of varied size in a multilayer (ML) configuration for dye-sensitized solar cells, the essence of our ML design is a bilayer system with additional layers of nanorods of well-controlled size inserted between the transparent and the scattering layers to enhance the light-harvesting capability for photosensitizers with small absorptivity, such as Z907. We measured charge-extraction and intensity-modulated photoelectric spectra to show the advantages of one-dimensional nanorods with an improved electron-transport property and an upward shift of the potential band edge; a favorable ML configuration was constructed to have a cascade potential feature for feasible electron transport from long nanorods, to normal nanorods, to small nanoparticles. On the basis of the ML system reported herein, we demonstrate how the performance of a Z907 device is improved to attain η ∼10%, which is a milestone for its future commercialization.

Original languageEnglish
Pages (from-to)1570-1577
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume4
Issue number9
DOIs
StatePublished - 2 May 2013

Keywords

  • charge extraction
  • charge recombination
  • dye-sensitized solar cells
  • impedance spectroscopy
  • nanorods
  • titania

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