Patent ID: 8129211

Claim:
A method for preparing a dye-sensitized solar cell, comprising the steps of preparing a semiconductor electrode, preparing a counter electrode, and charging an electrolyte between said two electrodes, wherein the preparation of the semiconductor electrode comprises: (a) preparing a metal oxide dispersion by dispersing metal oxide nanoparticles in an organic solvent in an amount of 0.01 to 5 wt %, without any added organic binder; (b) electrospraying the metal oxide dispersion on a conductive substrate to form metal oxide nanoballs having an average diameter of 50 to 3000 nm and a specific surface area of 70 to 300 m 2 /g which are agglomerated metal oxide nanoparticles disposed on the conductive substrate; (c) thermal-pressing the conductive substrate coated with the metal oxide nanoballs at a temperature of 50 to 200° C. under a pressure of 0.1 to 25 tons per 100 cm 2 ; (d) heat-treating the thermal-pressed conductive substrate coated with the metal oxide nanoballs at a temperature of 100 to 700° C. to prepare a metal oxide nanoball layer formed on the conductive substrate; and (e) conducting the absorption of a dye on the metal oxide nanoball layer.