Multistep electron transfer processes on dye co-sensitized nanocrystalline TiO2 films.
We report a method for achieving multilayer co-sensitization of nanocrystalline TiO2 films. The method is based upon an aluminum isopropoxide treatment of the monosensitized film prior to deposition of a second sensitizer. Appropriate selection of sensitizer dyes allows vectorial, multistep, electron transfer processes, resulting in a suppression of interfacial charge recombination and a significantly improved photovoltaic device performance relative to single-layer co-sensitization devices.
Clifford
John N
JN
Centre for Electronic Materials and Devices, Chemistry Department, Imperial College, South Kensington, Exhibition Road, SW 7 2AY London, United Kingdom.
Palomares
Emilio
E
Nazeeruddin
Md K
MK
Thampi
Ravindranathan
R
Grätzel
Michael
M
Durrant
James R
JR