Photovoltaic glass plated with temperable anti-reflection film layer and manufacturing method thereof

Abstract

The invention relates to packaging glass for solar cells, in particular to photovoltaic glass plated with a temperable anti-reflection film layer and a manufacturing method thereof. The photovoltaic glass comprises a low-iron super white patterned glass substrate (1) and an anti-reflection film layer (4), wherein one side of the low-iron super white patterned glass substrate (1) is a textured surface (2), while the other side is a patterned surface (3); the anti-reflection film layer (4) is plated on the textured surface (2) of the low-iron super white patterned glass substrate (1); the anti-reflection film layer (4) is formed by coating anti-reflection coating film liquid on the textured surface (2) of the low-iron super white patterned glass substrate (1) and performing surface drying, heating, pre-curing and tempering in turn; and a nano-scale silicon dioxide film layer is formed on the textured surface (2) of the low-iron super white patterned glass substrate (1). The photovoltaic glass plated with the temperable anti-reflection film layer produced by the method has the characteristics of high power generation increment, high film layer hardness, high acid and alkali resistance, high weather resistance, great film layer adhesion and the like.

Description

technical field [0001] The invention relates to a packaging glass for solar cells, in particular to a photovoltaic glass coated with a temperable anti-reflection film layer and a manufacturing method thereof. Background technique [0002] As an environmentally friendly new energy source, crystalline silicon solar cells have a very good development prospect. Since crystalline silicon cannot be exposed to the external environment for a long time, photovoltaic glass is currently one of the best packaging materials for protecting crystalline silicon and having a high light transmittance. The factors that determine the performance of crystalline silicon solar photovoltaic cells are related to light energy conversion efficiency. Among the various variables involved, the most important determinant is the crystalline silicon technology in photovoltaic components, followed by the photovoltaic glass used to protect photovoltaic components. It is far easier to improve the optical prop...

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Problems solved by technology

[0007] There are many patents in the field of anti-reflection film coating on the surface of glass for solar cell encapsulation, but it is generally required in the disclosed patents that the hard film temperature of the film layer (the temperature at which the film layer is firmly combined with the glass) should not exceed 550 ° C (publication number The invention patent of CN101308878A claims that the temperature range of hardening treatment is 150℃~550℃; in the invention patent with the publication number of CN100495734C, magnesium fluoride is used as a kind of anti-reflection material, and magnesium fluoride is mainly used in optical instrument lens And the coating of the optical filter, the claim does not include the hardening temperature, but the magnesium fluoride film layer is generally obtained by sputtering, and it is combined with the glass by van der Waals force, so it cannot withstand thermal shock above 500 °C; The drying temperature in the new patent implementation with the publication number CN201336311Y is 300°C-500°C; the invention patent with the publication number CN100412018C introduces a baking temperature of 300°C). The reason is that the coating film involved in the above patent In the liquid material, or containing organic components, or at 550 ° C, the main material in the film layer decomposes, resulting in the result that the anti-reflection effect is weakened or disappeared after high temperature. This is a technical difficulty that needs to be broken through in the industry.

As we all know, the encapsulation glass of crystalline silicon solar cells must be tempered glass, and the tempering temperature of encapsulation glass is generally 680℃~730℃. Coating after tempering, because the surface activity of the glass substrate is greatly reduced during tempering, the final anti-reflection coating layer is not very high in hardness, acid and alkali resistance, weather resistance or adhesion, and it is difficult to combine with crystal silicon The service life of the solar cell is more than 20 years. If the aging speed of the anti-reflection coating layer is too fast, not only will it not be able to play a long-term anti-reflection effect, but it may have the opposite effect of blocking light after the crystalline silicon solar cell has been used for a period of time. A photovoltaic glass coated with a toughened anti-reflection coating is one of the major research topics in the industry recently.

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