Design of OsII-based Sensitizers for Dye-Sensitized Solar Cells : Influence of Heterocyclic Ancillaries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Fa-Chun Hu
  • Sheng-Wei Wang
  • Miquel Planells
  • Neil Robertson
  • Harihara Padhy
  • Bo-Sian Du
  • Po-Fan Yang
  • Hao-Wu Lin
  • Gene-Hsiang Lee
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Pages (from-to)1366-1375
Journal / PublicationChemSusChem
Volume6
Issue number8
Online published10 Jul 2013
Publication statusPublished - Aug 2013
Externally publishedYes

Abstract

A series of OsII sensitizers (TFOS-x, in which x=1, 2, or 3) with a single 4,4′-dicarboxy-2,2′-dipyridine (H2dcbpy) anchor and two chelating 2-pyridyl (or 2-pyrimidyl) triazolate ancillaries was successfully prepared. Single-crystal X-ray structural analysis showed that the core geometry of the OsII-based sensitizers consisted of one H2dcbpy unit and two eclipsed cis-triazolate fragments; this was notably different from the RuII-based counterparts, in which the azolate (both pyrazolate and triazolate) fragments are located at the mutual trans-positions. The basic properties were extensively probed by using spectroscopic and electrochemical methods as well as time-dependent density functional theory (TD-DFT) calculations. Fabrication of dye-sensitized solar cells (DSCs) was then attempted by using the I-/I3--based electrolyte solution. One such DSC device, which utilized TFOS-2 as the sensitizer, showed promising performance characteristics with a short-circuit current density (JSC) of 15.7 mA cm-2, an open-circuit voltage of 610 mV, a fill factor of 0.63, and a power conversion efficiency of 6.08 % under AM 1.5G simulated one-sun irradiation. Importantly, adequate incident photon-to-current conversion efficiency performances were observed for all TFOS derivatives over the wide spectral region of 450 to 950 nm, showing a panchromatic light harvesting capability that extended into the near-infrared regime. Our results underlined a feasible strategy for maximizing JSC and increasing the efficiency of DSCs.

Research Area(s)

  • electrochemistry, energy conversion, heterocycles, osmium, sensitizers

Citation Format(s)

Design of OsII-based Sensitizers for Dye-Sensitized Solar Cells : Influence of Heterocyclic Ancillaries. / Hu, Fa-Chun; Wang, Sheng-Wei; Planells, Miquel; Robertson, Neil; Padhy, Harihara; Du, Bo-Sian; Chi, Yun; Yang, Po-Fan; Lin, Hao-Wu; Lee, Gene-Hsiang; Chou, Pi-Tai.

In: ChemSusChem, Vol. 6, No. 8, 08.2013, p. 1366-1375.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review