Solar cell

A solar cell comprising:

• a semiconductor substrate, a first tunneling layer, a first doped polysilicon layer, a first metal electrode, a second tunneling layer, an emitter including a second doped polysilicon layer, and a second metal electrode;
• wherein the front surface of the semiconductor substrate has a metal contact area and a non-metal contact area;
• wherein along the direction away from the front surface of the semiconductor substrate, the first tunneling layer, the first doped polysilicon layer and the first metal electrode are sequentially stacked on the metal contact area, wherein the first metal electrode is electrically connected to the first doped polysilicon layer;
• wherein along the direction away from the back surface of the semiconductor substrate, the second tunneling layer, the emitter including the second doped polysilicon layer and the second metal electrode are sequentially stacked on the back surface of the semiconductor substrate;
• and
• wherein the front surface of the semiconductor substrate is the main light-receiving surface, and the back surface of the semiconductor substrate is the non-main light-receiving surface, the semiconductor substrate and the first doped polysilicon layer have the same conductivity type, and the semiconductor substrate and the second doped polysilicon layer have different conductivity types;
• wherein the semiconductor substrate includes a base region and a first lightly doped region, the first lightly doped region is located under the non-metal contact area of the front surface of the semiconductor substrate, the first lightly doped region is in direct contact with the base region, the doping concentration of the first lightly doped region is greater than that of the base region and less than that of the first doped polysilicon layer, and the thickness of the first doped polysilicon layer is greater than the thickness of the first lightly doped region.