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

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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

Fingerprint

Porphyrins
porphyrins
Coloring Agents
Dyes
dyes
Nanoparticles
nanoparticles
Excited states
Zinc
irradiance
zinc
injection
Valence bands
Photocurrents
Pyridine
Quenching
Fluorescence
Particle size
excitation
photocurrents

ASJC Scopus subject areas

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

Cite this

Photoinjection of High Potential Holes into Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> Nanoparticles by Porphyrin Dyes. / Sullivan, Ian; Brown, Chelsea L.; Llansola-Portoles, Manuel J.; Gervaldo, Miguel; Kodis, Gerdenis; Moore, Thomas; Gust, Devens; Moore, Ana; Maggard, Paul A.

In: Journal of Physical Chemistry C, Vol. 119, No. 37, 17.09.2015, p. 21294-21303.

Research output: Contribution to journalArticle

Sullivan, Ian ; Brown, Chelsea L. ; Llansola-Portoles, Manuel J. ; Gervaldo, Miguel ; Kodis, Gerdenis ; Moore, Thomas ; Gust, Devens ; Moore, Ana ; Maggard, Paul A. / Photoinjection of High Potential Holes into Cu<inf>5</inf>Ta<inf>11</inf>O<inf>30</inf> Nanoparticles by Porphyrin Dyes. In: Journal of Physical Chemistry C. 2015 ; Vol. 119, No. 37. pp. 21294-21303.
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