Diffusion agent composition, method of forming impurity diffusion layer, and solar cell

摘要

A diffusion agent composition including an impurity-diffusing component (A); a binder resin (B) that thermally decomposes and disappears below a temperature at which the impurity-diffusing component (A) begins to thermally diffuse; SiO2 fine particles (C); and an organic solvent (D) that contains an organic solvent (D1) having a boiling point of at least 100° C.

主权项

1. A diffusing agent composition used to print an impurity diffusion component onto a semiconductor substrate, comprising:
an impurity diffusion component (A): a binder resin (B) that thermally decomposes and disappears below a temperature at which the impurity-diffusing component (A) starts to thermally diffuse into the semiconductor substrate, wherein the binder resin (B) comprises an acrylic resin comprising at least one polymerizable monomer selected from the group consisting of methyl methacrylate (MMA), methacrylic acid (MAA), isobutyl methacrylate (i-BMA), tertiary-butyl methacrylate (t-BMA), acrylic acid, ethyl acrylate, methyl acrylate, butyl acrylate, isobutyl acrylate, ethyl methacrylate, and butyl methacrylate; a SiO2 fine particle (C); and an organic solvent (D) comprising an organic solvent (D1) having a boiling point of at least 100° C., wherein the amount of the impurity-diffusing component (A) is 5 to 9 percent by mass with respect to the entire mass of the composition and 5 to 50 percent by mass with respect to the entire mass of the following solid components of the composition: the impurity-diffusing component (A), the binder resin (B), and the SiO2 fine particle (C).