Efficient solar cell structure

Abstract

The invention discloses an efficient solar cell structure which comprises a battery cell and grid lines, wherein the grid lines comprise main grid lines and thin grid lines, the main grid lines are arranged on the front surface of the battery cell, and the thin grid lines are uniformly vertical to the main grid lines. The efficient solar cell structure is characterized in that the main grid lines and the thin grid lines are formed by coating silver paste layers on silver wire meshes. Compared with the prior art, the efficient solar cell structure provided by the invention has the advantages of reducing collapse and spreading of silver paste through laying one silver wire mesh, increasing the height of the grid lines, therefore, the power generation efficiency of a solar cell is increased; and meanwhile, due to the adoption of the design of an optimal scheme, the efficient solar cell structure is simple, and is reasonable in design, thus power generation efficiency is better increased.

Description

technical field [0001] The invention relates to a solar cell, especially a high-efficiency solar cell structure. Background technique [0002] A silicon solar cell is a physical battery, a device that uses the principle of photovoltaics to directly convert light energy into electrical energy. Because of its clean, safe and reliable performance, it has been paid more and more attention by people. [0003] Solar cells generate electrons when exposed to light, and the electrons are collected on the main grid through the thin grid lines on the surface of the battery, and then the current is drawn out from the main grid. The grid line is to play a conductive role. Solar cell grid lines are generally made of silver paste, which is printed on the front of the solar cell through a specific screen, and then dried and sintered at high temperature. The size of the cross-sectional area of ​​the grid line determines its conductivity, and the grid line that is too thin is easy to break...

AI Technical Summary

Problems solved by technology

The size of the cross-sectional area of ​​the grid line determines its conductivity, and the grid line that is too thin is easy to break, so in terms of conductivity, the thicker grid line has better conductivity; in addition, because the grid line is printed on the front of the solar cell, and The front side is where the solar cell absorbs light. Because the metal silver paste is an opaque object, the thicker grid lines increase the shading of the effective illumination area (the area that can generate electricity) on the surface of the solar cell, which reduces the effective illumination of the battery. area, thereby reducing the overall power output of the battery, and although the thinner grid lines reduce the shading of the effective illumination area (the area capable of generating electricity) on the surface of the solar cell, but the grid lines that are too thin have high resistance and are easy to break. This also affects the overall power output of the battery

[0004] Based on the above problems, some people in the industry have proposed that increasing the height of the grid lines will increase the cross-sectional area of ​​the grid lines. However, the current solar cell structure is as follows: figure 1 As mentioned above, a grid line is provided on the battery sheet 1, and the grid line is formed by directly setting the silver paste on the position of the grid line, but considering that the silver paste for making the grid line is fluid, printing a high grid line will make the silver paste The slurry collapses and spreads on the surface of the battery, resulting in a larger shading area, so the effect is not obvious

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