A novel photoelectrochromic device with dual application based on poly(3,4-alkylenedioxythiophene) thin film and an organic dye

Chih Yu Hsu, Kun Mu Lee, Jen Hsien Huang, K. R. Justin Thomas, Jiann T. Lin, Kuo Chuan Ho*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

50 Scopus citations

Abstract

A novel photoelectrochromic device (PECD) with dual application was studied using an electrochromic polymer thin film, poly(3,3-diethyl-3,4-dihydro-2H-thieno-[3,4-b][1,4]dioxepine) (PProDot-Et2), and an organic photosensitive dye, FL dye1, which was adsorbed on a TiO2 electrode. In the presence of the redox couple, the electron transfer reaction at the electrolyte/PProDot-Et2 conducting polymer interface was found to determine the electrochromism of the PECD. The rate constants of the electron transfer (k0) for different redox couples at the PProDot-Et2 film were obtained by using electrochemical impedance spectroscopy (EIS) and were correlated with the coloration depth of the thin film. Since I-/I3- and Br-/Br3- couples possess the highest and the lowest k0 value, respectively, the PECD was investigated using these two redox couples under constant light illumination of 50 mW cm-2. The I-/I3- couple provided a higher short circuit current density (JSC) when acting as a dye-sensitized solar cell (DSSC), thus the switching response upon coloration (ca. 3 s) was much faster than that of the PECD using the Br-/Br3- couple (ca. 2 min). On the contrary, the PECD using Br-/Br3- exhibited a larger transmittance attenuation of ca. 33.7%, in comparison to that using I-/I3- (ca. 14.1%).

Original languageEnglish
Pages (from-to)1505-1508
Number of pages4
JournalJournal of Power Sources
Volume185
Issue number2
DOIs
StatePublished - 01 12 2008
Externally publishedYes

Keywords

  • Dye-sensitized solar cell (DSSC)
  • Electron transfer
  • Organic dye
  • Photoelectrochromic device (PECD)
  • Poly(3,4-alkylenedioxythiophene)

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