Novel tandem cell structure of dye-sensitized solar cell for improvement in photocurrent

Abstract A novel tandem cell structure is proposed to improve photocurrent of dye-sensitized solar cells (DSCs). Front and back parallel photoelectrodes are placed face-to-face; a common Pt-mesh counter electrode with transmittance is inserted between the electrodes. The short-circuit current density ( J sc ) for the tandem cell is equivalent to the sum of the J sc for the front and back photoelectrodes. A model using light energy absorbed by the photoelectrode is used to evaluate appropriate TiO 2 film thickness of the front photoelectrode. The J sc for the tandem cell was improved to 13.3 mA/cm 2 for a cell with a 7.8-μm-thick front photoelectrode. The novel tandem cell has a great potential to improve DSC photocurrent and performance.