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Strong interactions in dye-sensitized interfaces
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.ORCID iD: 0000-0002-9663-7705
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2008 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 112, no 15, 5972-5977 p.Article in journal (Refereed) Published
Abstract [en]

Phthalocyanines (Pcs) are capable of converting sunlight into electric energy when adsorbed on TiO2 in a dye-sensitized solar cell. Of special interest in this type of cell is the energy level alignment as well as how molecules adsorb on the surface as it determines the output of the cell. We investigated the FePc-TiO2(110) interface using scanning tunneling microscopy, synchrotron-based photoelectron spectroscopy, and X-ray absorption spectroscopy. We found a strong coupling of the first-layer FePc to the substrate resulting in an alteration of the electronic structure and charge transfer from the molecules. The FePc in the second layer is not severely affected by the bonding to the surface and has bulk-like electronic properties. The growth of FePc thin films proceeds in a layer plus island mode, and the molecular plane is parallel to the surface. The energy level alignment at the interface is determined, and the lowest unoccupied molecular orbital is found above the conduction band minimum of the oxide substrate.

Place, publisher, year, edition, pages
2008. Vol. 112, no 15, 5972-5977 p.
Keyword [en]
SCANNING-TUNNELING-MICROSCOPY; COPPER-PHTHALOCYANINE; IRON PHTHALOCYANINE; THIN-FILMS; PHOTOELECTRON-SPECTROSCOPY; ZINC PHTHALOCYANINE; ELECTRON-TRANSFER; TITANIUM-DIOXIDE; SOLAR-CELLS; TIO2 FILMS
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Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-36415DOI: 10.1021/jp711311sISI: 000254883100042Scopus ID: 2-s2.0-43749099257OAI: oai:DiVA.org:kth-36415DiVA: diva2:430774
Note
QC 20110712Available from: 2011-07-12 Created: 2011-07-12 Last updated: 2017-12-11Bibliographically approved

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Yu, Shun

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Palmgren, PålYu, ShunNlebedim, Cajetan IkennaGötelid, Mats
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