Patent ID: 11901467
Assignee: ZHEJIANG JINKO SOLAR CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A solar cell, comprising:
a substrate;
an emitter, a first passivation film, an antireflection film and a first electrode that are disposed on an upper surface of the substrate;
a tunneling layer, a retardation layer, a field passivation layer, a second passivation film and a second electrode that are disposed on a lower surface of the substrate;
wherein the retardation layer is configured to retard migration of doped ions from the field passivation layer to the substrate, and the retardation layer includes:
a first retardation sub-layer aligned with a projection of the second electrode, and
a second retardation sub-layer misaligned with a projection of the second electrode, wherein at least the second retardation sub-layer is an intrinsic semiconductor layer, and a material of the intrinsic semiconductor layer is the same as a material of the field passivation layer;
wherein a thickness of the first retardation sub-layer is smaller than a thickness of the second retardation sub-layer in a direction perpendicular to the lower surface of the substrate;
wherein the first retardation sub-layer includes at least two film layers, the at least two film layers includes a first surface layer toward the tunneling layer and a second surface layer toward the field passivation layer; a material of the first surface layer is a metal, and a material of the second surface layer is a compound generated from a reaction with the metal.