High-reflectance film and manufacturing method thereof

Abstract

The invention discloses a high-reflectance film which comprises a base layer, a high-reflectance layer and a protection layer, wherein the base layer, the high-reflectance layer and the protection layer are sequentially arranged on a substrate. The base layer is tightly attached to the substrate. The high-reflectance layer comprises a silver-copper alloy layer. The protection layer comprises an Al2O3 layer, a SiO2 layer and a Ti3O5 layer, wherein the Al2O3 layer, the SiO2 layer and the Ti3O5 layer are arranged in sequence, and the Al2O3 layer is tightly attached to the high-reflectance layer. The high-reflectance film is high in reflectance and resistant to high temperature and corrosion. The invention further discloses a manufacturing method of the high-reflectance film. The manufacturing method comprises the steps that the substrate is placed in a vacuum chamber of a film plating machine, the substrate is plated with the base layer, the high-reflectance layer and the protection layer in sequence, and then the high-reflectance film is obtained. The manufacturing method is simple and beneficial to formation of the high-reflectance film with good adhesion and compactness, so that the high-reflectance film has excellent reflecting performance and high resistance to high temperature and corrosion.

Description

technical field [0001] The invention relates to the field of light reflection devices, in particular to a high reflection film and a preparation method thereof. Background technique [0002] In the solar energy harvesting system, the focused solar energy harvesting system is an advanced solar energy conversion system, and its photoelectric conversion efficiency is twice that of the ordinary monocrystalline silicon solar energy harvesting system, and a well-made system can even reach that of the ordinary monocrystalline silicon system. 2.8 times, with the continuous development of energy demand, its application prospect is undoubtedly broad, and the light collection efficiency and stability of the focusing system is an important indicator of the focused solar system, therefore, the focusing device is continuously stable and efficient It has become a key technology that engineers urgently need to solve. [0003] The existing focusing system gathers light with a bandwidth of 4...

AI Technical Summary

Problems solved by technology

If a dielectric high-reflection film is used, due to the limitation of the characteristics of the dielectric film itself, its reflection bandwidth is far from reaching the standard of 400-1800nm, and when the incident angle increases, the reflectivity decreases and the loss of light energy is serious, which is obviously not advisable; if If the existing metal high-reflection film is used, the high-reflection film may be oxidized and corroded by high temperature after a long time, resulting in loss of light energy and lower collection efficiency. The high reflection film with enough bandwidth and high temperature and corrosion resistance has become a barrier restricting its development

The main technical problem is: in the metal high-reflection film, the adhesion and compactness of each film layer are limited, air and water vapor easily enter the metal film layer, and the metal film layer is easily oxidized under high temperature and high temperature and high humidity environment Corrosion, at the same time, the defects of the film layer caused by the particles and foreign matter introduced in the preparation process will aggravate the generation of corrosion, which not only reduces the reflectivity of the metal film and loses light energy, but also the corroded and peeled film layer may accumulate and block the optical path. On the channel opening, the collection efficiency of light energy will be further reduced, and even the device will be deformed and cracked under the action of high temperature and residual film stress

Although this technical solution can achieve focused heat collection or photoelectricity to a certain extent, which improves the receiving efficiency of the system, the focusing mirror still adopts the existing technology, and the reflective film on the focusing mirror still has the above-mentioned technical problems

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