Method for making solar cell and solar cell

A method for making a solar cell, comprising:

• Step S1:
• providing a silicon substrate and texturing the silicon substrate, the silicon substrate being an N-type silicon substrate and comprising a first surface, a second surface opposite to the first surface, and at least one side surface connecting each of the first surface and the second surface, and texturing being performed on the first surface of the silicon substrate;
• Step S2:
• performing boron doping to the silicon substrate;
• Step S3:
• removing a boron doped diffusion layer and borosilicate glass on the second surface and on the at least one side surface;
• Step S4:
• forming a tunnel oxide layer and a doped polycrystalline silicon layer on the second surface;
• Step S5:
• removing phosphorus silicon glass and a polycrystalline silicon layer on the first surface and the at least one side surface, phosphorus silicon glass on the second surface, and borosilicate glass on the first surface;
• Step S7:
• depositing an anti-reflection layer on each of the first surface and the second surface;
• Step S8:
• forming metal grid lines on each of the first surface and the second surface thereby forming a solar sheet;
• Step S9:
• applying a deflection voltage to the solar sheet, wherein the deflection voltage has an electric field in a first direction, the first direction is a direction from the second surface to the first surface, and the deflection voltage is in a range from 5 V to 30 V;
• and
• Step S10:
• maintaining the deflection voltage and using laser to scan the metal grid lines on the first surface, wherein the laser has a power density in a range from 500 W/cm2 to 50000 W/cm2 and a scanning speed in a range from 20000 mm/s to 60000 mm/s.