KETEP 세계에너지시장정보

1. A method for preparing solar cells, wherein the preparation method of the solar cell (1) comprises:double-sided fleece making of silicon substrate (11);boron expansion is carried out on the silicon substrate (11), and a boron diffusion layer (111) and a borosilicate glass layer (112) are generated on the front and back of the silicon substrate (11);the front of the silicon substrate (11) has a first contact zone (113) and a first non-contact zone (114), and the borosilicate glass layer (112) and the boron diffusion layer (111) of the first non-contact zone (114) are laser removed;wherein, when boron expansion is carried out on the silicon substrate (11), wet oxygen and dry oxygen are passed, and the ratio of wet oxygen to the dry oxygen ω satisfies 0%<ω≤20%; The density ρ1 of the borosilicate glass layer (112) satisfies 1.32g/cm3<ρ1≤2.65g/cm3.