Solar cell and preparation method therefor
AssigneeTongwei Solar (Meishan) Co., Ltd.
InventorsYangxu Jiang, Xiupeng Wang, Guoqiang Xing
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Abstract
In one aspect, a method for preparing a solar cell includes: forming a selective emitter on a front side of the solar cell, the selective emitter including first and second doped regions, and a P-type doping concentration of the first doped region being greater than that of the second doped region; and bringing a positive electrode of the solar cell to be in electrical contact with the first doped region. The disclosed method can effectively improve a filling factor of the solar cell while ensuring a lower Auger recombination and improving an open circuit voltage and a short-circuit current such that the solar cell has higher conversion efficiency.
Claims10
A method for preparing a solar cell, comprising:
- forming a selective emitter on a front side of the solar cell, wherein the selective emitter comprises a first doped region and a second doped region, and a P-type doping concentration of the first doped region is greater than a P-type doping concentration of the second doped region;
- and
- bringing a positive electrode of the solar cell to be in electrical contact with the first doped region,
- wherein a step of forming the selective emitter on the front side of the solar cell comprises:
- providing an N-type silicon wafer having a P-N junction;
- printing a boron slurry on an entire front side of the silicon wafer, selecting a part of the entire front side of the silicon wafer as a preset area of the front side of the silicon wafer;
- and
- pushing the boron slurry from the preset area of the front side of the silicon wafer to a P-type doping area of the front side of the silicon wafer to form the first doped region, and taking a remaining part of the P-type doping area as the second doped region.
Dependencies are inferred from the claim text.