Patent ID: 7939749

Claim:
A dye-sensitized solar cell, comprising: a first electrode and a second electrode substantially parallel with each other; a porous membrane provided between the first electrode and the second electrode and having a dye adsorbed thereto; an electrolyte provided between the first electrode and the second electrode; and a buffering layer interposed between the first electrode and the porous membrane and having at least a first layer and a second layer, wherein the first layer comprises a conduction band energy level that is less than a conduction band energy level of the porous membrane, wherein the second layer is provided between the first layer and the porous membrane and comprises a conduction band energy level that is higher than that the conduction band energy level of the first layer, wherein the first layer and the second layer have a particle size less than a particle size of the porous membrane, and wherein the first layer is arranged directly on the first electrode.