Electrophoretic deposition of crack-free magnesium oxide-coated tin oxide film and its application in dye-sensitized solar cells

•Magnesium oxide-coated tin oxide (MgO-coated SnO2) aggregates were prepared by a facile method.•Crack-free MgO-coated SnO2 films were prepared using electrophoretic deposition.•The prepared photoanodes showed high IPCE value in the long wavelength region between 550 nm and 700 nm.

Magnesium oxide-coated tin oxide aggregates were prepared by a facile method. The aggregates consisted of nanoparticles which provided a large surface area of 74.27 m2 g−1. Crack-free MgO-coated SnO2 porous films were prepared using electrophoretic deposition method. The causes which prevent the forming of cracks were also discussed. For the application in dye-sensitized solar cells, the electrophoresis conditions, such as the amount of MgO loading and deposition duration, were optimized. The MgO-coated SnO2 photoanodes showed excellent photovoltaic response in the long wavelength region between 550 nm and 700 nm The optimized MgO-coated SnO2 photoanodes showed an overall power conversion efficiency above 7.0% under AM 1.5G illumination (100 mW cm−2), having a short circuit current density, open circuit voltage, and fill factor of 20.0 mA cm−2, 0.618 V and 0.57, respectively.