The method of producing a composition, method of producing the n-type diffusion layer and a solar cell element formed of an n-type diffusion layer

n-type diffusion layer of the present invention for forming a composition comprising: a donor element containing a life time killer element and the total amount of glass powder is 1000ppm or less; and a dispersion medium. It is formed by coating the n-type diffusion layer composition, embodiment of a thermal diffusion treatment to produce an n-type diffusion layer and a solar cell element having an n-type diffusion layer.