Patent ID: 7846823

Claim:
The manufacturing method of a solar cell comprising the step of: applying a masking paste containing SiO 2 and/or a SiO 2 precursor with a pattern on a semiconductor substrate, drying the paste after the step of applying a paste containing SiO 2 and/or a SiO 2 precursor with a pattern on a semiconductor substrate, baking the paste in an oxygen atmosphere to form a mask for controlling diffusion of a dopant, diffusing the dopant to form a patterned diffusion layer, wherein a masking paste used as said mask for controlling diffusion is manufactured by preparing a mixed liquid containing (a) a formula R′ n Si(OR) 4 , (R′ is methyl, ethyl, or phenyl, R is methyl, ethyl, n-propyl, or i-propyl, and n is 0, 1, or 2), (b) a solvent, (c) an acid, and (d) water, and then vaporizing alcohol by heating at a temperature not lower than the boiling point of the alcohol produced by a hydrolysis reaction of said (a) and not higher than the boiling point of the solvent.