Influence of the bridging atom on the electrochromic performance of a cyclopentadithiophene polymer

Er Chieh Cho, Cai Wan Chang-Jian, Yu Sheng Hsiao, Kuen Chan Lee, Jen Hsien Huang

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


In this article, carbon- (PCPDTTBT) and silicon-bridged (PSiPDTTBT) cyclopentadithiophene (CPDT)-based polymers have been synthesized. We have systematically studied the effect of replacing a carbon atom with a silicon atom on the main chain of the conjugated polymer and the optoelectronic properties. With the simple substitution, the results indicate that the PSiPDTTBT reveals a higher crystallinity, improved thermal stability, charge transport properties, and lower resistance at the polymer-electrolyte interface. As a result, the PSiPDTTBT exhibits better electrochromic properties including higher contrast and coloration efficiency (CE) with respect to its carbon analogs. We attribute this better electrochromic performance to the presence of strong π-π stacking in the silicon-bridged CPDT-based polymer. The PSiPDTTBT shows a transmittance window of 55.5% at 560 nm and CE of 434 mC/cm2.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalSolar Energy Materials and Solar Cells
Publication statusPublished - Jun 2016


  • Coloration efficiency
  • Conjugated polymer
  • Crystallinity
  • Cyclopentadithiophene
  • Electrochromic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment


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