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Effect of structural optimization on the photovoltaic performance of dithieno[3,2-b:2′,3′-d] pyrrole-based dye-sensitized solar cells

RSC Advances, ISSN: 2046-2069, Vol: 7, Issue: 57, Page: 35598-35607
2017
  • 10
    Citations
  • 0
    Usage
  • 12
    Captures
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    12

Article Description

Five novel organic push-pull dyes, DT, CD-T, TD-T, CD-C and TD-P, based on carbazole or triphenylamine as donors, dithieno[3,2-b:2′,3′-d]pyrrole as a π-spacer and cyanoacetic acid as an acceptor were synthesized, and their structures were optimized for DSSCs. Dithieno[3,2-b:2′,3′-d]pyrrole was linked with either carbazole or triphenylamine via a Suzuki coupling reaction. Followed by formylation via a Vilsmeier-Haak reaction, and then a Knoevenagel condensation reaction was employed to link cyanoacetic acid, producing the carbazole-based dyes CD-C and CD-T and the triphenylamine-based dyes TD-P and TD-T. Meanwhile, the dye DT was synthesized as a reference for comparison. The molar extinction coefficients of the carbazole-based dyes CD-T and CD-C were 56-370 M cm and 62-471 M cm, while those of the dyes based on triphenylamine, TD-T and TD-P, were 44-555 M cm and 49-945 M cm, respectively. The optimized power conversion efficiency of CD-T reached 6.63% with an open-circuit voltage of 710 mV, a short-circuit current density of 14.55 mV cm, and a fill factor of 0.64.

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