A solar energy assembly with double-layer protective films

Abstract

The invention relates to a solar energy assembly with double-layer protective films. The solar assembly with the double-layer protective films comprises a negative electrode layer, an N type silicon layer, a P type silicon layer, and a positive electrode layer, wherein the above-mentioned layers are sequentially stacked. Besides, the solar assembly also includes an antireflection film layer and a passivation film layer; the antireflection film layer is arranged between the negative electrode layer and the N type silicon layer; and the passivation film layer is arranged between the antireflection film layer and the N type silicon layer. According to the invention, a silicon nitride film that is deposited by through plasma enhanced chemical vapor deposition (PECVD) is employed as the antireflection film layer of the solar assembly, so that light reflection can be reduced. Moreover, the silicon nitride film contains lots of hydrogen and thus surface dangling bonds in the silicon can be passivated well, thereby improving the carrier mobility. Meanwhile, because the silicon dioxide film is deposited between the silicon nitride film and the N type silicon, the reflection loss of incident lights at the solar cell surface can be effectively reduced and thus the absorbed sunlight amount of the solar assembly can be enhanced; and the solar assembly can absorb all sunlight spectrums from all angles, so that the economic benefits of a solar power station can be substantially improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar module with double-layer protective films. Background technique [0002] Solar cell modules, also called solar panels, are the core part of the solar power generation system and the most important part of the solar power generation system. A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. As a green energy source, solar cells are attracting more and more attention. The quality of crystalline silicon materials plays a vital role in the efficiency of solar cells. The surface defect density of crystalline silicon substrate materials is very high, such as a large number of dangling bonds, impurities, and broken bonds, etc., resulting in a greatly reduced minority carrier lifetime on the silicon wafer surface and a relatively low recombination rate. Low. Contents of the inventio...

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Problems solved by technology

The quality of crystalline silicon materials plays a vital role in the efficiency of solar cells. The surface defect density of crystalline silicon substrate materials is very high, such as a large number of dangling bonds, impurities, and broken bonds, etc., resulting in a greatly reduced minority carrier lifetime on the silicon wafer surface and a relatively low recombination rate. Low

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