Surface photovoltage analysis of Pd-porphyrin/ultra-thinnanoporous TiO2 systems

MATÍAS FUNES; PHILIPP ZABEL; THOMAS DITTRICH; EDGARDO N. DURANTINI; LUIS OTERO

Weimar Alemania

Congreso; 12th International Conference on the Formation of Semiconductor Interfaces; 2009

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mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Interaction induced transition in the nanoporous TiO2 / Pd-porphyrin system Matías Funes1, Philipp Zabel*,2, Thomas Dittrich2, Edgardo N. Durantini1 and Luis Otero1 Molecules of Pd(II) 5-(4-carboxyphenyl)-10,15,20-tris(4-methylphenyl) porphyrin were adsorbed from highly diluted dichloromethane solution on ultra-thin layers of nanoporous TiO2 and investigated by modulated surface photovoltage (SPV) spectroscopy. An additional transition with a maximum at 2.03 eV appeared in the SPV spectra after moderate annealing in vacuum irrespective to the amount of adsorbed molecules. The new transition has been ascribed to the formation of a charge transfer complex due to an interaction between the Pd centred porphyrin and Ti surface atoms.