title: Photosensitization of SnO(2)/ZnO semiconductors with zinc-phthalocyanine.
abstract: Zinc-phthalocyanine with tyrosine substituent (ZnPcTyro) was attached to different nanocrystalline semiconductors (SnO(2) and ZnO) via carboxylic acid group, the interaction of zinc-phthalocyanine with colloidal ZnO and SnO(2) was studied by absorption and fluorescence spectroscopy. The apparent association constant for the association between ZnPcTyro and SnO(2)/ZnO is ranged from (3.7+/-0.2)x10(5)M(-1) to (6.7+/-0.2)x10(4)M(-1) with a degree of association ranged from 85% to 95%. The presence of the tyrosine group in ZnPcTyro affects solubility of the dye and affects the aggregation behavior of the dye. Anchoring of the dye complex to the nanocrystalline semiconductors enables ultrafast injection of electrons from the excited state into the conduction band of semiconductors. Maximum incident photon-to-current conversion of 0.84-1% at 600 nm and photon-to-current conversion efficiency of around 37% and 43% was obtained for ZnPc-sensitized-SnO(2) and ZnPc-sensitized-ZnO.
authors.affiliation: Department of Chemistry, University of Al al-Bayt, P.O. Box 130040, Mafraq 25113, Jordan. readsa@yahoo.com
authors.forename: Raed
authors.initials: R
authors.lastname: Ghanem
mesh_terms: D003102:Colloids; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D008956:Models, Chemical; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D055668:Photochemical Processes; D012666:Semiconductors; D012995:Solubility; D013050:Spectrometry, Fluorescence; D017971:Tin Compounds / Q000737:chemistry*; D017967:Zinc Compounds; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D003102:Colloids; D004396:Coloring Agents; D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017971:Tin Compounds; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine; C045358:stannic oxide; D015034:Zinc Oxide