Patent ID: 11967656
Assignee: JINKO SOLAR CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A method for preparing a photovoltaic cell, comprising:
providing a substrate;
forming an initial passivation layer on a first surface of the substrate, and
performing doping treatments on the initial passivation layer to form a passivation layer having a plurality of first portions and a plurality of second portions interleaved with each other in a direction perpendicular to a normal of the first surface of the substrate;
wherein the plurality of first portions and the plurality of second portions are doped with a same type of doping elements, each respective second portion of the plurality of second portions has a respective reference surface away from the substrate, a doping concentration of doping elements in the respective second portion gradually decreases in a direction from a center of the respective reference surface toward an adjacent first portion and gradually decreases in a direction from the center of the respective reference surface toward the substrate, and a doping concentration of doping elements anywhere in the adjacent first portion is less than or equal to a minimum doping concentration of doping elements in the respective second portion.