US 11,990,554 B2
Solar cell and method for producing same
Jingsheng Jin, Shanghai (CN); and Xinyu Zhang, Shanghai (CN)
Assigned to Jinko Green Energy (Shanghai) Management Co., LTD., Shanghai (CN); and Zhejiang Jinko Solar Co., Ltd., Haining (CN)
Filed by Jinko Green Energy (Shanghai) Management Co., LTD., Shanghai (CN); and ZHEJIANG JINKO SOLAR CO., LTD., Zhejiang (CN)
Filed on Aug. 2, 2022, as Appl. No. 17/878,914.
Application 17/878,914 is a continuation of application No. 17/133,560, filed on Dec. 23, 2020, granted, now 11,450,775.
Claims priority of application No. 202011307502.0 (CN), filed on Nov. 19, 2020.
Prior Publication US 2022/0376122 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01L 31/0216 (2014.01); H01L 31/0224 (2006.01); H01L 31/0236 (2006.01); H01L 31/068 (2012.01); H01L 31/18 (2006.01)
CPC H01L 31/02167 (2013.01) [H01L 31/02168 (2013.01); H01L 31/022441 (2013.01); H01L 31/02363 (2013.01); H01L 31/0682 (2013.01); H01L 31/1868 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A solar cell, comprising:
a substrate;
a first passivation film, an anti-reflection layer and at least one first electrode sequentially formed on a front surface of the substrate; and
a tunneling layer, a field passivation layer and at least one second electrode sequentially formed on a rear surface of the substrate; wherein:
the field passivation layer includes a first field passivation sub-layer corresponding to a portion of the field passivation layer in a first region between the at least one second electrode and the substrate, and a second field passivation sub-layer corresponding to a portion of the field passivation layer in a second region between adjacent second electrodes;
a conductivity of the first field passivation sub-layer is greater than a conductivity of the second field passivation sub-layer, and a thickness of the second field passivation sub-layer is smaller than a thickness of the first field passivation sub-layer;
a surface doping concentration of a top surface of the second field passivation sub-layer facing away from the substrate is lower than a surface doping concentration of a top surface of the first field passivation sub-layer facing away from the substrate;
each of the first field passivation sub-layer and the second field passivation sub-layer includes an ion diffusion layer, the first field passivation sub-layer further includes an ion enrichment layer disposed on a surface of the ion diffusion layer of the first field passivation sub-layer facing away from the substrate, both the ion diffusion layer and the ion enrichment layer of the first field passivation sub-layer are doped with ions, and a doping concentration of the ion enrichment layer is greater than a doping concentration of the ion diffusion layer of the first field passivation sub-layer; and
the top surface of the second field passivation sub-layer is closer to the substrate than the top surface of the first field passivation sub-layer, and a thickness of the ion diffusion layer of the first field passivation sub-layer is greater than a thickness of the ion diffusion layer of the second field passivation sub-layer in the direction away from the substrate toward the field passivation layer.