Method for making solar cell and solar cell

Abstract

A method for making a solar cell includes: providing and texturing a silicon substrate including a first surface and a second surface opposite to the first surface; performing boron diffusion and high-temperature oxidation treatment on the silicon substrate; forming a tunnel oxide layer and a doped polycrystalline silicon layer on a second surface; depositing a passivation layer on the first surface or both the first surface and the second surface; depositing anti-reflection layers on the first and second surfaces; forming metal grid lines on both the first and second surfaces to form a solar sheet; applying a deflection voltage to the solar sheet; maintaining the deflection voltage and using laser to scan the metal grid lines on the first surface.