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Sensitized hole injection of phosphorus porphyrin into NiO: Toward new photovoltaic devices
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.
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2005 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, no 48, 22928-22934 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes the preparation and the characterization of a photovoltaic cell based on the sensitization of a wide band gap p-type semiconductor (NiO) with a phosphorus porphyrin. A photophysical study with femtosecond transient absorption spectroscopy showed that light excitation of the phosphorus porphyrin chemisorbed on NiO particles induces a very rapid interfacial hole injection into the valence band of NiO, occurring mainly on the 2-20 ps time scale. This is followed by a recombination in which ca. 80% of the ground-state reactants are regenerated within 1 ns. A photoelectrochernical device, prepared with a nanocrystalline NiO electrode coated with the phosphorus porphyrin, yields a cathodic photocurrent indicating that electrons indeed flow from the NiO electrode toward the solution. The low incident-to-photocurrent efficiency (IPCE) can be rationalized by the rapid back recombination reaction between the reduced sensitizer and the injected hole which prevents an efficient regeneration of the sensitizer ground state from the iodide/triiodide redox mediator. To the best of our knowledge, this work represents the first example of a photovoltaic cell in which a mechanism of hole photoinjection has been characterized.

Place, publisher, year, edition, pages
2005. Vol. 109, no 48, 22928-22934 p.
Keyword [en]
singlet-state properties, electron-transfer, nanocrystalline tio2, nanostructured nio, dye sensitization, excited-states, electrochemistry, films, cell, spectroelectrochemistry
URN: urn:nbn:se:kth:diva-15234DOI: 10.1021/jp054034aISI: 000233761300031ScopusID: 2-s2.0-29444449286OAI: diva2:333275
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Boschloo, GerritHagfeldt, Anders
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