Dyes bound to wide band gap metal oxide semiconductor nanoparticles such as TiO2 or ZnO are of great interest for renewable energy projects.  Metalloporphyrins (ZnTPP) have attracted considerable attention as sensitizing chromophores due to their tunable photophysical properties and stability. In our previous work with ZnTPP model compounds bound to semiconductors through COOH groups we found that ZnTPP  planar (�spiders�) to the semiconductor surface resulted in more efficient  solar cells than  rigid-rod models. In this presentation we introduce the synthesis and preliminary photophysical and photoelectrochemical studies of capped and strapped porphyrins, designed to prevent self-aggregation and contacts with the semiconductor (thereby �insulating� the chromophoric unit), while providing a constrain on the conformation of the anchor units.

Capped and strapped Zn(II) tetraphenyl porphyrins as sensitizing dyes for TiO<sub>2</sub>

240th National Meeting (2010)

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Capped and strapped Zn(II) tetraphenyl porphyrins as sensitizing dyes for TiO2

Capped and strapped Zn(II) tetraphenyl porphyrins as sensitizing dyes for TiO₂