Surface compostions of dye/TiO2 interfaces formed from ethanol, acetonitrile, and dichloromethane based solutions

• The molecular and electronic surface structure of three TiO2 surfaces sensitized with 3-(5-(4-(diphenyl amino) styryl) thiophen-2-yl)-2-cyanoacrylic acid (D5) using different solvents (acetonitrile, dicloromethane, and ethanol) was investigated by photoelectron spectroscopy. The results showed solvent dependence in surface coverage, dye surface structure and energy level matching. Corresponding basic results on photocurrent conversion and UV-vis absorption is also included. Together the results indicated surface aggregation when using dichloromethane as a solvent.

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