Efficient all back electrode type solar cell

Abstract

The invention relates to the technical field of solar cells, in particular to an efficient all back electrode type solar cell. The solar cell comprises a solar panel arranged on the outer layer, wherein a zigzag stepped surface with long edges and short edges arranged alternately is arranged on the bottom of the solar panel, each long edge is provided with a PN junction diffusion layer and a diffusion layer electrode, and each short edge is provided with a substrate electrode. Due to the fact that the PN junction diffusion layers are arranged on the zigzag long edges, the contact area between a P region and an N region, namely the area of a PN junction region is increased as much as possible. Besides, due to the fact that the substrate electrode layers are arranged on the short edges of the stepped surface, the short edges are arranged to be perpendicular to the surface of the solar panel as far as possible, so that solar rays shining on the solar panel can almost completely shine on the PN junction diffusion layers. In this way, the area of the PN junction diffusion layers can be increased, solar rays can be fully absorbed, sufficient width is guaranteed for the substrate electrode layers, and then the electric generating capacity and conversion efficiency of the solar cell are improved to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a high-efficiency all-back-electrode solar cell. Background technique [0002] Energy is the foundation of a country's economic and social development. The widely used fossil energy such as oil, natural gas, and coal is facing severe challenges. The development and utilization of clean, green, and renewable energy is the key to solving the contradiction between energy and the environment and achieving sustainable development. important guarantee. [0003] Among all renewable energy sources, solar energy has greater advantages in terms of the quantity of resources, the universality of distribution, cleanliness, and the reliability and maturity of technology. Photovoltaic power generation has become the first choice for renewable energy utilization. The primary way, while crystalline silicon solar cells have always occupied the largest share of the photovoltaic market. Like o...

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Problems solved by technology

[0006] Taking an N-type substrate full-back electrode solar panel as an example, since only the P-type diffusion layer (PN junction diffusion layer) on the back can form a PN junction with the N-type substrate to realize photovoltaic power generation, it is hoped that the P-type diffusion layer The larger the occupied area, the better, but in order to maximize the power generated by the solar cell, the N-type substrate on the back and the electrode layer on the P-type diffusion layer must be arranged alternately, and the N-type substrate electrode layer must have Sufficient width; in this way, the effective area of ​​the solar cell is actually reduced, and the power generation and conversion efficiency of the solar cell are reduced to a certain extent

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