P type PERC two-sided solar battery and back electrode structure thereof

Abstract

The invention discloses a back electrode structure. The back electrode structure comprises at least one back silver main gate, a plurality of parallel aluminum gate lines and an aluminum gate outer frame, wherein an overlapped and connected region is formed between the aluminum gate lines and the back silver main gate; the overlapped and connected region is wound around the periphery of the back silver main gate; in the overlapped and connected region, the back silver main gate is covered with the aluminum gate lines; each back silver main gate comprises at least two back silver sub main gates; a disconnection section is formed between every two back silver sub main gates; at least one connecting line is arranged in the disconnecting region; the back silver sub main gates are connected mutually through the corresponding connecting line; the back silver sub main gates is connected with the aluminum gate outer frame through the corresponding connecting line; or each back silver main gate is provided with at least one hollow-out part. Correspondingly, the invention also discloses a P type PERC two-sided solar battery adopts the back electrode structure. The battery is simple in structure, relatively low in cost, high in electrical conductivity, and high in photoelectric conversion efficiency.

Description

Technical field [0001] The present invention relates to the field of solar cells, in particular to a back electrode structure of a P-type PERC double-sided solar cell and a battery adopting the back electrode structure. Background technique [0002] Solar cell power generation uses solar cells to directly convert solar energy into electrical energy. Because it is a green environmentally friendly product, it will not cause environmental pollution, and it is a renewable resource. Therefore, in today's energy shortage situation, solar cells are a kind of A new type of energy with a bright future. [0003] The production process of P-type PERC double-sided solar cells includes: texturing, diffusion, etching, back passivation layer deposition, PECVD back coating, front PECVD coating, screen printing, sintering, and annealing. In the process of converting light energy into electrical energy, the photo-generated carriers generated inside the solar cell need to be collected and drawn out ...

AI Technical Summary

Problems solved by technology

The design of the back electrode pattern determines the current collection effect and light-receiving area of ​​the back passivation battery, thereby affecting the photoelectric conversion efficiency of the battery. Therefore, it is necessary to propose a new back electrode that can improve the conductivity of the electrode, reduce the shading area, and improve Photoelectric conversion efficiency of the battery

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