| CPC H10F 77/311 (2025.01) [H10F 19/904 (2025.01); H10F 77/1227 (2025.01); H10F 77/703 (2025.01)] | 20 Claims |
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1. A solar cell, comprising:
an N-type substrate;
a P-type emitter formed on a first surface of the N-type substrate;
a tunnel layer and a doped conductive layer formed over a second surface of the N-type substrate in a direction away from the N-type substrate; and
first metal electrodes, formed on the first surface of the N-type substrate;
wherein the P-type emitter comprises a first portion and a second portion, the first portion has first pyramid structures, and the second portion has second pyramid structures;
wherein each respective first pyramid structure of at least some of the first pyramid structures has a respective transition surface on at least one edge of the respective first pyramid structure, the respective transition surface is joined with two adjacent inclined surfaces of the respective first pyramid structure, and the respective transition surface is concave or convex relative to a center of the respective first pyramid structure;
wherein a spherical or sphere-like substructure is formed on top of each of at least some of the first pyramid structures; and
wherein the first metal electrodes are electrically connected to the first portion of the P-type emitter.
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