Ferroelectric BaTiO3 dipole induced charge transfer enhancement in dye-sensitized solar cells

Keyuan Feng, Xiaoyan Liu, Donghui Si, Xiao Tang, An Xing, Minoru Osada, Peng Xiao

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

BaTiO3/TiO2 nanocomposite films with varied amount of BaTiO3 are fabricated and applied as photoanodes for dye-sensitized solar cells (DSCs) and demonstrated enhanced power conversion efficiency. Ferroelectricity of BaTiO3 in the film after subjected to a annealing process up to 450 °C is examined by Switching Spectroscopy Piezoresponse Force Microscopy (SSPFM). The highest performance is achieved in 1.0 wt% BaTiO3 addition as a result of increased photocurrent density (Jsc) and fill factor (FF), regardless of reduction of dye-loading. Electrochemical impedance spectroscopy (EIS) measurements at different bias voltages (≦Voc) in dark suggest that ferroelectric dipole induced electric field has positive effects on enhancing electron mobility and suppressing charge recombination. Although more detailed experiments are needed in designing of the nanocomposite films for compensating characteristics of dye-loading and electron mobility, introduction of ferroelectric dipole induced electric field into the photoanode would be a good strategy in achieving further improvement of power conversion efficiency of DSCs through improved charge transfer properties.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalJournal of Power Sources
Volume350
DOIs
Publication statusPublished - 2017 May 15
Externally publishedYes

Keywords

  • Charge recombination
  • Dye-sensitized solar cells
  • Electron mobility
  • Ferroelectric dipole induced electric field

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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