A sharp photocurrent enhancement in photoelectrochemical cells with a photocathode sensitized by dye films of rhodamine-C-18 and methylviolet-C-18 prepared by Langmuir-Blodgett techniques

It was found that the photocurrent quantum efficiency df photoelectrochemical cells with p-CuSCN photocathode sensitized with double dye layers such as Rhodamine-C-18 and Methylviolet-C-18 is greatly enhanced (similar to 15%), when the double dye system is prepared using Langmuir-Blodgett (LB) technique. An ordered arrangement of dye molecules in LB films provides a suitable condition to transfer photogenerated holes and electrons between two dye layers, so that photogenerated holes upon excitation can transfer effectively into the valence band of p-CuSCN.