Dual Functional Polymer Interlayer for Facilitating Ion Transport and Reducing Charge Recombination in Dye-Sensitized Solar Cells

Ying Chiao Wang, Shao Sian Li, Cheng Yen Wen, Liang Yih Chen, Kuo Chuan Ho, Chun Wei Chen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dye-sensitized solar cells (DSSCs) present low-cost alternatives to conventional wafer-based inorganic solar cells and have remarkable power conversion efficiency. To further enhance performance, we propose a new DSSC architecture with a novel dual-functional polymer interlayer that prevents charge recombination and facilitates ionic conduction, as well as maintaining dye loading and regeneration. Poly(vinylidene fluoride-trifluoroethylene) (p(VDF-TrFE)) was coated on the outside of a dye-sensitized TiO2 photoanode by a simple solution process that did not sacrifice the amount of adsorbed dye molecules in the DSSC device. Light-intensity-modulated photocurrent and photovoltage spectroscopy revealed that the proposed p(VDF-TrFE)-coated anode yielded longer electron lifetime and improved the injection of photogenerated electrons into TiO2, thereby reducing the electron transport time. Comparative cyclic voltammetry and UV-visible absorption spectroscopy based on a ferrocene-ferrocenium external standard material demonstrated that p(VDF-TrFE) enhanced the power conversion efficiency from 7.67% to 9.11%. This dual functional p(VDF-TrFE) interlayer is a promising candidate for improving the performance of DSSCs and can also be employed in other electrochemical devices.

Original languageEnglish
Pages (from-to)33666-33672
Number of pages7
JournalACS Applied Materials and Interfaces
Volume8
Issue number49
DOIs
Publication statusPublished - Dec 14 2016
Externally publishedYes

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Keywords

  • dye-sensitized solar cell
  • ionic conductivity
  • p(VDF-TrFE) copolymer
  • recombination
  • solution process

ASJC Scopus subject areas

  • Materials Science(all)

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