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Sensitized hole inj...
Sensitized hole injection of phosphorus porphyrin into NiO : Toward new photovoltaic devices
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- Borgström, Magnus (författare)
- Uppsala universitet,Fysikalisk kemi I
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Blart, E. (författare)
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- Boschloo, Gerrit (författare)
- KTH,Fysikalisk kemi
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- Mukhtar, Emad (författare)
- Uppsala universitet,Fysikalisk kemi I
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- Hagfeldt, Anders (författare)
- KTH,Organisk kemi
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- Hammarström, Leif (författare)
- Uppsala universitet,Fysikalisk kemi I
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Odobel, F. (författare)
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(creator_code:org_t)
- 2005-11-10
- 2005
- Engelska.
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 109:48, s. 22928-22934
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- singlet-state properties
- electron-transfer
- nanocrystalline tio2
- nanostructured nio
- dye sensitization
- excited-states
- electrochemistry
- films
- cell
- spectroelectrochemistry
- NATURAL SCIENCES
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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