Photoinjection of High Potential Holes into Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> Nanoparticles by Porphyrin Dyes

Ian Sullivan, Chelsea L. Brown, Manuel J. Llansola-Portoles, Miguel Gervaldo, Gerdenis Kodis, Thomas Moore, Devens Gust, Ana Moore, Paul A. Maggard

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Excited-state hole injection into the valence band of Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> nanoparticles (NP-Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf>) was investigated through sensitization with zinc porphyrin dyes using simulated solar irradiance. The Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> nanoparticles were prepared by a flux-mediated synthesis and found to have an average particle size of ∼10-15 nm by DLS and TEM. The zinc 4-(10,15,20-tris(4-pyridinyl)-porphin-5-yl)phenylphosphonic acid (D1) and its analogue, in which the pyridine groups are methylated (D2), were synthesized and found to have excited-state reduction potentials appropriate for p-type dye sensitization of the nanoparticles. The dye-sensitized NP-Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> exhibited fluorescence quenching consistent with electron transfer from the NP-Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> to the dye; forward and recombination rates were obtained by transient absorption measurements. Hole injection times of 8 ps and <100 fs were observed for D1 and D2, respectively. Nanoparticulate films of Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> were prepared and evaluated in dye-sensitized solar cells under simulated solar irradiance (AM 1.5 G, 100 mW/cm<sup>2</sup>). Measurable photocurrents and open-circuit potentials (V<inf>oc</inf>) of 200 and 110 mV were observed using D1 and D2, respectively.

Original languageEnglish (US)
Pages (from-to)21294-21303
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number37
DOIs
StatePublished - Sep 17 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

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