Double antireflection layer structure of solar cell reflection film and preparation method thereof

Abstract

The invention relates to a double antireflection layer structure of a solar cell reflection film and a preparation method thereof. The double antireflection layer structure is formed by an upper antireflection layer, a crater antireflection layer and a base layer in sequence. The crater antireflection layer in the middle is provided with arc-slope concave craters. The upper antireflection layer is composited on the upper surface of the crater antireflection layer and is formed by a bottom layer film and particles densely arranged thereon, wherein the surface of each particle has a suede shape. The bottom layer film and the upper surface of the crater antireflection layer are integrated and jointly form the concave craters. The crater layer is prepared through deposition by adopting the PECVD technology; the PECVD technology can be used to prepare the uniform and performance-stable crater layer structure; the controllability is high; and the thickness of the antireflection layer can be controlled accurately. A solar cell has more than 90 % high transmissivity. The antireflection layer is simple in specific processes, quick in deposition time and low in energy consumption; the double antireflection layers has sequentially-increasing refractive rate; and the structure can provide possibility for large-area industrial production.

Description

technical field [0001] The invention relates to a solar cell, in particular to a reflective film in a solar cell structure and a preparation method thereof. Background technique [0002] It is well known that reflection and refraction occur simultaneously when light propagates at the interface of two media. From the perspective of energy, for any transparent medium, the energy of light does not completely pass through the interface, but a part of it always reflects back from the interface. For example, when the air is incident on the interface of the PET substrate, the reflected light energy accounts for about 6% of the incident light energy. In practical applications, sometimes it is necessary to adopt a multi-layer structure, which will cause greater loss of light energy. In addition, these reflected lights will also generate harmful stray light during the display process, which will affect the clarity of imaging. In order to avoid this situation, an anti-reflection fil...

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Problems solved by technology

[0003] At present, solar cells on the market adopt the method of coating anti-reflection film to reduce the reflection of the battery on incident light, passivate the surface of the battery to improve the efficiency and life of the battery, etc., but the anti-reflection effect and passivation effect of the single-layer film are not very ideal. , the incident light loss is still very large (see figure 1 shown)

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