Crystalline silicon solar cells

Abstract

The invention relates to a silicon solar battery piece which comprises a crystal silicon slice, a front face grid line and a back face electrode. The front face grid line is located on the illuminated face of a battery and comprises a main grid and a vice grid. The main grid comprises primary main grids and secondary main grids, wherein the number of the primary main grids is at least two, the primary main grids are mutually parallel, each primary main grid is divided into at least two sections, and the secondary main grids are connected at the positions of fractured openings of the primary main grids through regular or irregular shapes or lines. The vice grid comprises primary vice grids and secondary vice grids, wherein the primary vice grids are evenly distributed outside the shapes which are formed by the secondary main grids and are perpendicular to the primary main grids, and the secondary vice grids are located inside the shapes which are formed by the secondary main grids and are arranged parallel to the primary main grids. On one hand, direct contact of a main gate electrode and the silicon slice can be decreased, surface passivation area is enlarged, the illuminated area of the solar battery is increased, and the photoelectric conversion efficiency of the solar battery is effectively improved; and on the other hand, silver paste consumption in the manufacturing process can be effectively reduced, and production cost is lowered.

Description

technical field [0001] The invention relates to a solar cell, in particular to a crystalline silicon solar cell. Background technique [0002] The rapid development of the solar energy industry needs to continuously reduce the cost of materials, improve the efficiency of photoelectric conversion to reduce the cost of power generation, and achieve the goal of being the same price as the mains electricity or lower than the price of the mains electricity. [0003] With the development of industrialization, conventional crystalline silicon cells have made great progress in improving conversion efficiency and reducing costs. The manufacturing process of crystalline silicon solar cells generally has the following steps: chemical cleaning and surface texture treatment, diffusion junction, edge etching and phosphorus silicon glass removal, anti-reflection film deposition, electrode printing, and sintering. In the process of converting light energy into electrical energy in a solar ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, solar cells adopt a structure of two main grids or three main grids, and the area covered by the main grid lines and auxiliary grid lines on the silicon wafer is relatively large, which makes the shading rate of the grid lines in the prior art reach more than 6%, reducing the The utilization efficiency of solar cells

In addition, precious metals are required as conductive paste when printing electrodes, and the large area covered by the main grid lines and sub-grid lines on the silicon wafer will inevitably increase the use of conductive paste. higher cost

Images