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Improved photon-to-current conversion efficiency with a nanoporous p-type NiO electrode by the use of a sensitizer-acceptor dyad

Morandeira, Ana and Fortage, Jerome and Edvinsson, Tomas and Le Pleux, Loic and Blart, Errol and Boschloo, Gerrit and Hagfeldt, Anders and Hanmiarstrom, Leif and Dobel, Fabrice (2008) Improved photon-to-current conversion efficiency with a nanoporous p-type NiO electrode by the use of a sensitizer-acceptor dyad. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (5). pp. 1721-1728.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp077446n

Abstract

A peryleneimide sensitizer and a covalently linked peryleneimide-naphthalenediimide dyad were prepared and characterized by absorption and emission spectroscopies, electrochemistry, and spectroelectrochemistry. These compounds were chemisorbed on nanoporous nickel oxide electrodes and then studied by femtosecond transient absorption spectroscopy in the presence of a redox active electrolyte (I-3(-)/I-). In both compounds, upon excitation of the peryleneimide unit, an electron is efficiently ejected from the valence band of NiO to the dye with an average time constant of approximately 0.5 ps. In the case of the dyad, the excess electron is shifted further onto the naphtalenediimide unit, creating a new charge separated state. The latter exhibits a substantial retardation of the charge recombination between the hole and the reduced molecule compared with the peryleneimide sensitizer. The photoaction spectra of a sandwich dye-sensitized solar cell (DSSC) composed of NiO films and these new dyes were recorded, and the absorbed-photon to current conversion efficiency (APCE) was three times higher with the dyad than with the peryleneimide dye: 45%. The maximum APCE of approximately 45% is the highest value reported for a DSSC based on a nanostructured metal oxide p-type semiconductor.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Technology > Nanotechnology and energy applications
Physical Science > Photonics
ID Code:1838
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 14:46
Last Modified:16 Dec 2008 14:46

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