Composition for forming n-type diffusion layer, method for producing n-type diffusion layer, and method for manufacturing solar cell element

Provided are: a composition for forming an n-type diffusion layer, the composition containing glass powder including a donor element and having a particle diameter d90 of 0.1-1.5 µm, and a dispersion medium; a method for producing an n-type diffusion layer by using the composition; and a method for manufacturing a solar cell element.