The original Grätzel photoelectrical sye-sensitized solar cells was fabricated with TiO2 thin-films developed in our laboratories. As such, we have had a long interest in this type of photoelectrochemical system. Recently, G24 Innovations in Cardiff, Wales, have opened an experimental reel to reel process ultimately intended to produce 30 MW of Dye Sensitized Solar Cells per year! We have recently been exploring the importance of dye adsorption in these systems.