Color film for improving conversion efficiency of cadmium telluride film solar cell and preparation method thereof

Abstract

The invention discloses a colored thin film for improving the conversion efficiency of a cadmium telluride thin-film solar cell, which is characterized in that according to a spectral response curve of the cadmium telluride thin-film solar cell, the plated thin film is anti-reflective in a range of 500-900nm, the conversion efficiency of the cell is improved, and meanwhile, the reflection of the cell is increased in a range of 380nm-500nm, so that the cell has a color. Comprising the following steps that S1, a substrate is cleaned, stains on the surface of the substrate are removed, and the substrate is blow-dried; s2, the cleaned substrate is placed in magnetron sputtering coating equipment; s3, metal zirconium serves as a plane target, a direct-current power source is adopted, argon serves as sputtering gas, oxygen serves as reaction gas, and a first layer of high-reflection-film zirconium oxide thin film is deposited on the substrate through magnetron sputtering; s4, depositing a second layer of antireflection film silicon oxide thin film on the substrate through magnetron sputtering by taking silicon as a rotating target, adopting a medium-frequency power supply, taking argon as sputtering gas and taking oxygen as reaction gas; the conversion efficiency of the cadmium telluride thin film solar cell is improved, the cadmium telluride thin film solar cell is colored, and the absorption interval transmittance of the cadmium telluride thin film solar cell is improved.

Description

Technical Field

[0001] The invention relates to the technical field of glass film manufacturing, in particular to a color film for improving the conversion efficiency of cadmium telluride thin film solar cells. Background Art

[0002] Thin-film solar cells are highly praised for their low cost and high conversion rate, and are the trend of future new energy. However, thin-film solar cells are dark in color, which leads to a narrow range of applications. Simple laminated or colored glass will reduce their transmittance and affect their power generation efficiency.

[0003] Cadmium telluride thin film solar cells are the most widely used thin film solar cells in the current market. They have excellent characteristics such as high conversion efficiency and low cost, and are called oil on the wall. However, due to its own color, it is limited in actual application in buildings. Summary of the invention

[0004] The purpose of the present invention is to design a color film and a preparation method thereof for improving the conversion efficiency of cadmium telluride thin film solar cells by utilizing the principle of optical interference. The color film can be applied to cadmium telluride thin film solar cells to make them have multiple colors while increasing their conversion efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A color film for improving the conversion efficiency of cadmium telluride thin film solar cells, characterized in that: According to the spectral response curve of cadmium telluride thin film solar cells, in the spectral response range of 500nm-900nm, combined with the visible light region of sunlight 380nm-760nm, the coated film increases transmittance in the range of 500nm-900nm, thereby improving the conversion efficiency of the cell and increases reflection in the range of 380nm-500nm to give the cell color.

[0006] A method for preparing a color film for improving the conversion efficiency of a cadmium telluride thin film solar cell comprises the following steps: S1: Clean the substrate, remove stains on the substrate surface and blow dry; S2: placing the cleaned substrate into a magnetron sputtering coating device; S3: Using metal zirconium as a planar target, a DC power supply, argon as a sputtering gas, and oxygen as a reaction gas, the first layer of anti-reflection zirconium oxide film is deposited on the substrate by magnetron sputtering; S4: Using silicon as a rotating target, a medium frequency power supply, argon as a sputtering gas, and oxygen as a reaction gas, a second layer of antireflection film silicon oxide film is deposited on the substrate by magnetron sputtering.

[0007] The beneficial effects of the present invention are: 1. Use high refractive index materials such as zirconium oxide and low refractive index materials such as silicon oxide to plate composite films, so that the film system has a reflection enhancement effect at 380nm-500nm and an anti-reflection effect at 500nm-900nm, so that the film has color and is anti-reflective in its spectral absorption region, thereby improving its conversion efficiency.

[0008] Second, use the optical interference effect to adjust the film thickness so that the anti-reflection band and the anti-transmission band have no overlapping area and are independent of each other.

[0009] 3. The implementation examples of the present invention are all implemented on a pilot line and can be directly scaled up to production line applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is the spectral response curve of cadmium telluride thin film solar cell; Figure 2 This is the transmittance spectrum of Example 1 of the present invention; Figure 3 This is the transmittance spectrum of Example 2 of the present invention. DETAILED DESCRIPTION

[0011] Implementation Example 1 S1. Place the cleaned glass substrate into the magnetron sputtering coating equipment and evacuate the sputtering chamber. When the vacuum degree is 7*10 -6 Torr, metal zirconium was used as the target material, a DC power supply of 3KW was used, and 200sccm of argon was introduced for pre-sputtering; after the pre-sputtering was completed, the oxygen partial pressure was 55sccm, and the vacuum degree was 4.5*10 -3 Sputtering 75 times at Torr, thickness 170nm; S2, transfer the zirconium oxide coated glass to the silicon target position, when the vacuum degree is 7*10 -6 Torr, rotating silicon is used as the target; a medium frequency power supply of 5Kw is used, and 200sccm of argon is introduced for pre-sputtering; after the pre-sputtering is completed, an oxygen partial pressure of 45sccm is introduced, and the vacuum degree is 4.0*10 -3 The thickness of the silicon dioxide film obtained by sputtering 24 times at 100 Torr was 106nm. The prepared color film has an a value of 9.09, a b value of -19.63, a blue color, and an average transmittance of 92.9% from 500nm to 900nm. Implementation Example 2 S1. Use 1.1mm ordinary glass as the substrate, clean the substrate, remove the stains on the substrate surface and blow dry; evacuate the sputtering chamber, and when the vacuum degree is 7*10 -6 Torr, metal zirconium was used as the target, a DC power supply of 3KW was used, and 200sccm of argon was introduced for pre-sputtering. After the pre-sputtering was completed, the oxygen partial pressure was 55sccm, and the vacuum degree was 4.5*10 -3Torr, sputtered 75 times, thickness 170nm.

[0012] S2, transfer the zirconium oxide coated glass to the silicon target position, when the vacuum degree is 7*10 -6 Torr, rotating silicon is used as the target. A medium frequency power supply of 5Kw is used, 200sccm argon is introduced for pre-sputtering, and after the pre-sputtering is completed, an oxygen partial pressure of 45sccm is introduced, and the vacuum degree is 4.0*10 -3 Torr, sputtering 22 times, the thickness of the silicon dioxide film is 96nm. The prepared color film has an a value of 7.98, a b value of -11.71, and a purple color. Figure 3 As shown, the color film (170nm + silica 96nm) has an average transmittance of 92.3% at wavelengths between 500nm-900nm.

[0013] Table 1 Comparison between application examples and ordinary color batteries a, b values Transformation efficiency Ordinary blue battery 15.59，-33.15 8.75% Example 1 (blue) 9.09,-19.63 12.53% Ordinary purple battery 11.89,20.04 9.12% Example 2 7.98,-11.71 13.04% The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form; any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A color film for improving the conversion efficiency of cadmium telluride thin film solar cells, characterized in that: According to the spectral response curve of cadmium telluride thin film solar cells, in the spectral response range of 500nm-900nm, combined with the visible light region of sunlight 380nm-760nm, the coated film increases transmittance in the range of 500nm-900nm, thereby improving the conversion efficiency of the cell and increases reflection in the range of 380nm-500nm to give the cell color.

2. The method for preparing a color film for improving the conversion efficiency of a cadmium telluride thin film solar cell according to claim 1, characterized in that The following steps are involved: S1: Clean the substrate, remove stains on the substrate surface and blow dry; S2: placing the cleaned substrate into a magnetron sputtering coating device; S3: Using metal zirconium as a planar target, a DC power supply, argon as a sputtering gas, and oxygen as a reaction gas, the first layer of anti-reflection zirconium oxide film is deposited on the substrate by magnetron sputtering; S4: Using silicon as a rotating target, a medium frequency power supply, argon as a sputtering gas, and oxygen as a reaction gas, a second layer of antireflection film silicon oxide film is deposited on the substrate by magnetron sputtering.

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