Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co(III)/(II) Mediators: Strategies to Improve Charge Collection Efficiency
作者： Miriam Mba , Marco D’Acunzo , Patrizio Salice , Tommaso Carofiglio , Michele Maggini
DOI: 10.1021/JP4067586
关键词:
摘要: The photoelectrochemical properties of thiophene-triphenylamine (TTPA) sensitizers (TTPA1–3) used in association with different cobalt based mediators, including kinetically fast shuttles such as [Co(bpy)3]3+/2+ and [Co(phen)3]3+/2+ sterically hindered couples like [Co(dtb)3]3+/2+ were studied by combining molecular modeling, spectroscopic, techniques. results indicate that the presence multiple anchoring points on dye structure improves its adsorption stability onto TiO2 but induces a pseudoplanar geometry which is not suited to insulate properly surface semiconductor back contact, against electron recombination; particularly when are employed. This drawback could be successfully countered exploiting both compact blocking underlayer chemisorption octyl triethoxysilane (Si–C8) acting barrier surface, thus limiting access oxidized mediator exposed...
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