We also fabricated other three DSSCs with double layers coated by using paste-3 and paste-1 with different thickness,and the best power efficiency is 7.2%. In this cell, the thickness of paste-3 coating and paste-1 coatings were 5 m and 10 m,respectively. Further increasing the thicknesses of coatings made of paste-3 and pastes leaded to the decrease of power efficiency,which may be due to that the photoanode thickness is beyond the length of electron transport.