US 12,278,299 B1
Solar cell, method for preparing the same and photovoltaic module
Bike Zhang, Haining (CN); Bo Zhang, Haining (CN); Jingsheng Jin, Haining (CN); Mengwei Xu, Haining (CN); and Jiani Qin, Haining (CN)
Assigned to JINKO SOLAR (HAINING) CO., LTD., Zhejiang (CN)
Filed by JINKO SOLAR (HAINING) CO., LTD., Haining (CN)
Filed on Jan. 8, 2024, as Appl. No. 18/407,363.
Claims priority of application No. 202311297963.8 (CN), filed on Oct. 9, 2023.
Int. Cl. H01L 31/0352 (2006.01); H01L 31/18 (2006.01); H01L 31/068 (2012.01)
CPC H01L 31/03529 (2013.01) [H01L 31/1804 (2013.01); H01L 31/068 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A solar cell, comprising:
an N-type silicon substrate having a front surface and a rear surface opposite to the front surface; wherein the front surface has a plurality of pyramid structures, and the rear surface has a plurality of grooves, at least one subset of the plurality of grooves being arranged sequentially along one arrangement direction;
a passivation layer, formed over the front surface;
a tunneling dielectric layer, formed on the rear surface; and
a doped conductive layer, formed over the tunneling dielectric layer;
wherein one respective groove of at least some of the plurality of grooves is recessed relative to the rear surface and has a bottom surface, a top opening opposite to the bottom surface, and a side wall located between the bottom surface and the top opening, and an area of an orthographic projection of the bottom surface of the one respective groove on the N-type silicon substrate is less than an area of an orthographic projection of the top opening of the one respective groove on the N-type silicon substrate; and
wherein an orthographic projection of each groove of the at least one subset of the plurality of grooves on the N-type silicon substrate is in a shape of a polygon with M sides, and M is a positive integer greater than or equal to 4.