Laminated refraction-reducing film for polycrystalline silicon solar cell

Abstract

The invention provides a laminated refraction-reducing film for a polycrystalline silicon solar cell. The laminated refraction-reducing film is arranged on the front surface of a polycrystalline silicon substrate (3) of a solar cell, and is sequentially provided with a silicon dioxide layer (2) and a silicon oxynitride layer (1) from inside to outside. The laminated refraction-reducing film adopts a silicon dioxide hollow ball thin film with the refractive index being 2.05 and a silicon oxynitride thin film with the refractive index being 1.5-1.8; compared with a single-layer film, the laminated film has better optical matching property, not only has the excellent refraction-reducing effect on light with the wavelength of 520 nm, which has a response in a main spectrum of silicon, but also has very good refraction-reducing effect on light with the wavelength of 300-1200 nm; and thus the conversion efficiency of the polycrystalline silicon solar cell is improved. With the adoption of the structure, the conversion efficiency of the polycrystalline silicon solar cell which is industrially manufactured is more than 19.5%, which reaches the highest level in the world.

Description

technical field [0001] The invention relates to a structure of a refraction-reducing film for a solar cell, in particular to a laminated refraction-reducing film structure, in particular to a laminated refraction-reducing film for a polycrystalline silicon solar cell. [0002] Background technique [0003] A single solar cell cannot be directly used as a power source. As a power supply, several single cells must be connected in series and parallel and tightly packed into components. Solar cell modules (also called solar cell modules) are the core part of the solar power generation system and the most important part of the solar power generation system. Its function is to convert solar energy into electrical energy. The conversion efficiency of solar cells is generally defined as the ratio of the output power of the cell to the total power of sunlight incident on the surface of the cell. Sunlight will be reflected and refracted when it hits the surface of the cell. In ord...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the current single-layer anti-refraction film is difficult to obtain the ideal anti-refraction effect, and propose a laminated anti-refraction film for polycrystalline silicon solar cells, which is a high-quality, high-performance refraction film structure

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