Multifunctional Iodide-Free Polymeric Ionic Liquid for Quasi-Solid-State Dye-Sensitized Solar Cells with a High Open-Circuit Voltage

Yi Feng Lin, Chun Ting Li, Chuan Pei Lee, Yow An Leu, Yamuna Ezhumalai, R. Vittal, Ming Chou Chen*, Jiang Jen Lin, Kuo Chuan Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

A polymeric ionic liquid, poly(oxyethylene)-imide-imidazolium selenocyanate (POEI-IS), was newly synthesized and used for a multifunctional gel electrolyte in a quasi-solid-state dye-sensitized solar cell (QSS-DSSC). POEI-IS has several functions: (a) acts as a gelling agent for the electrolyte of the DSSC, (b) possesses a redox mediator of SeCN-, which is aimed to form a SeCN-/(SeCN)3- redox couple with a more positive redox potential than that of traditional I-/I3-, (c) chelates the potassium cations through the lone pair electrons of the oxygen atoms of its poly(oxyethylene)-imide-imidazolium (POEI-I) segments, and (d) obstructs the recombination of photoinjected electrons with (SeCN)3- ions in the electrolyte through its POEI-I segments. Thus, the POEI-IS renders a high open-circuit voltage (VOC) to the QSS-DSSC due to its functions of b-d and prolongs the stability of the cell due to its function of a. The QSS-DSSC with the gel electrolyte containing 30 wt % of the POEI-IS in liquid selenocyanate electrolyte exhibited a high VOC of 825.50 ± 3.51 mV and a high power conversion efficiency (η) of 8.18 ± 0.02%. The QSS-DSSC with 30 wt % POEI-IS retained up to 95% of its initial η after an at-rest stability test with the period of more than 1,000 h.

Original languageEnglish
Pages (from-to)15267-15278
Number of pages12
JournalACS Applied Materials and Interfaces
Volume8
Issue number24
DOIs
Publication statusPublished - 2016 Jun 22
Externally publishedYes

Keywords

  • dye-sensitized solar cell
  • electrolyte
  • iodide-free
  • polymeric ionic liquid
  • polyoxyethylene
  • quasi-solid-state
  • selenocyanate

ASJC Scopus subject areas

  • Materials Science(all)

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