Drying method of polyimide paste and manufacturing method of solar cell having high photoelectric conversion efficiency

A manufacturing method of a solar cell which includes a cured polyimide film formed with cured polyimide as part of a structure of the solar cell, the manufacturing method comprising:

• a step of forming a pn junction which joins a p-type layer and an n-type layer within a semiconductor substrate;
• a step of forming a p-type electrode which electrically contacts the p-type layer;
• and
• a step of forming an n-type electrode which electrically contacts the n-type layer, and, further, when the cured polyimide film is formed,
• a step of applying a polyimide paste which includes an organic solvent and a polyimide resin dissolved in the organic solvent, and which becomes the cured polyimide by being cured as a result of being dried and heated, to a surface of a structure including the semiconductor substrate;
• a step of applying a solvent including a polar material of at least one type among water, ethylene glycol, acetic acid, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, and formic acid, to a surface of the structure including the semiconductor substrate at least at a portion where the polyimide paste is applied;
• a step of, after applying the solvent including the polar material, drying the polyimide paste and the solvent including the polar material;
• and
• a step of heating and curing the dried polyimide paste to form the cured polyimide film.