Fluorene-bridged organic dyes with di-anchoring groups for efficient co-adsorbent-free dye-sensitized solar cells

Chi Ho Siu, Lawrence Tien Lin Lee, Po Yu Ho, Poulomi Majumdar, Cheuk Lam Ho, Tao Chen, Jianzhang Zhao, Hua Li, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)


A series of new fluorene-bridged organic dyes with di-anchoring groups have been synthesized and well characterized. Such a molecular design strategy using two organic anchors inhibits the undesirable charge recombination and prolongs the electron lifetime which results in significant enhancement of the power conversion efficiency (η). These findings were supported by the results from electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD). Under standard AM 1.5 irradiation (100 mW cm-2), the best dye-sensitized solar cell (DSSC) exhibits a high η of 6.11% without the need for co-adsorbent addition. An open-circuit photovoltage (Voc) of 0.753 V, a short-circuit photocurrent density (Jsc) of 11.20 mA cm-2and a fill factor (ff) of 0.725 were measured in such co-adsorbent-free cells. The high Vocvalue is mainly attributed to the improved electron lifetime (τn) and high resistance to the recombination of electrons (Rrec) of 422.38 Ω.
Original languageEnglish
Pages (from-to)7086-7095
Number of pages10
JournalJournal of Materials Chemistry C
Issue number34
Publication statusPublished - 14 Sep 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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