Photovoltaic solar cell electrode anti-oxidation method

Abstract

The invention discloses an anti-oxidation method for an electrode of a photovoltaic solar cell, and relates to the technical field of solar cells. Printing copper paste on the ITO thin film layer to form a copper layer, and curing the copper layer formed by printing; uniformly printing ink on the surface of the copper paste by using ink-jet printing equipment to form a protective layer; and carrying out curing treatment on the protective layer formed by ink-jet printing by adopting ultraviolet light. The oxidation resistance of the copper paste is improved, the overall performance of a photovoltaic cell is improved, the method is suitable for manufacturing various photovoltaic solar cells, the sustainability of the process is improved, and the application prospect is wide.

Description

Technical Field

[0001] The invention relates to the technical field of solar cells, and in particular to a method for preventing oxidation of photovoltaic solar cell electrodes. Background Art

[0002] Photovoltaic solar cells play an important role in energy utilization. Traditional photovoltaic cells still use conductive silver paste as the conductive material. However, as a precious metal, metallic silver has limited reserves and high costs. It may face the risk of supply shortage and cost increase in the future, and its sustainability is poor. Due to cost issues, copper paste is gradually replacing silver paste. In order to improve the antioxidant properties of copper paste, it is usually necessary to add an anti-oxidation protective layer on the surface of copper paste. Based on this, it is particularly necessary to develop a method for anti-oxidation of photovoltaic solar cell electrodes. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for anti-oxidation of photovoltaic solar cell electrodes, simplify the process, effectively improve the anti-oxidation performance of copper paste, enhance the overall performance of photovoltaic cells, improve the sustainability of the process, and facilitate popularization and use.

[0004] In order to achieve the above object, the present invention is implemented by the following technical solution: a method for preventing oxidation of photovoltaic solar cell electrodes, the steps of which are:

[0005] (1) printing copper paste on the indium tin oxide (ITO) thin film layer to form a copper layer;

[0006] (2) Curing treatment: curing the copper layer formed by printing;

[0007] (3) Inkjet printing: The insulating ink is loaded into the inkjet printing device, and the ink is evenly printed on the surface of the copper paste using the inkjet printing device to form a protective layer;

[0008] (4) Secondary curing: Use ultraviolet light to cure the protective layer formed by inkjet printing to ensure that it has sufficient mechanical strength and insulation performance during use.

[0009] Preferably, the copper paste printed in step (1) has a line width of 30-350 μm, and a thickness of the copper layer of 10-25 μm.

[0010] Preferably, in step (2), the copper layer is cured in a nitrogen protective environment using a nitrogen curing box, the curing temperature is 120-230° C., and the curing time is 10-25 min.

[0011] Preferably, the ink viscosity used in the step (3) is 15-65cp, the transmittance is not less than 90%, and the conductivity of the ink is 500-7500S / cm; during inkjet printing, the ink layer is evenly printed by controlling the printing parameters of the nozzle speed, the injection pressure, and the printing path, and the ink layer is completely printed on the surface of the copper paste. The ink protection layer formed by printing has a height of 10-45μm and a width of 100-250μm.

[0012] Preferably, the wavelength of the ultraviolet light in step (4) is 250-450nm, and the curing energy of the curing treatment operation is 300-5000mj / cm 2 .

[0013] Beneficial effects of the present invention: The method effectively improves the anti-oxidation performance of copper paste, enhances the overall performance of photovoltaic cells, is suitable for the manufacture of various photovoltaic solar cells, improves the sustainability of the process, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0015] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] Reference Figure 1 , this specific implementation adopts the following technical solution: a method for preventing oxidation of photovoltaic solar cell electrodes, the steps of which are:

[0018] (1) printing a copper paste with a line width of 30-350 μm on the indium tin oxide (ITO) thin film layer to form a copper layer with a thickness of 10-25 μm;

[0019] (2) Curing treatment: The printed copper layer is cured in a nitrogen protection environment using a nitrogen curing box at a curing temperature of 120-230°C and a curing time of 10-25 minutes;

[0020] (3) Inkjet printing: Load the insulating ink into the inkjet printing device, and use the inkjet printing device to evenly print the ink on the surface of the copper paste to form a protective layer. The height of the ink protective layer is controlled to be 10-45 μm and the width is 100-250 μm;

[0021] (4) Secondary curing: Use ultraviolet light to cure the protective layer formed by inkjet printing to ensure that it has sufficient mechanical strength and insulation performance during use.

[0022] It is worth noting that the ink viscosity used in the step (3) is 15-65cp, the conductivity of the ink is 500-7500S / cm, and the transmittance is not less than 90%. The ink layer has high transmittance and will not affect the photoelectric conversion efficiency of the solar cell. During inkjet printing, the ink layer is evenly printed by controlling the printing parameters of the nozzle speed, injection pressure, and printing path, and the ink layer is completely printed on the surface of the copper paste.

[0023] In addition, the wavelength of the ultraviolet light in step (4) is 250-450nm, and the curing energy of the curing treatment operation is 300-5000mj / cm 2 .

[0024] This specific implementation method forms a high-transmittance anti-oxidation protective layer on the surface of the copper paste through inkjet printing technology, which can prevent the oxidation of the copper paste in the natural environment and improve the stability and service life of the solar cell. The process is simple and easy to operate, and it is suitable for the manufacture of various types of photovoltaic solar cells, improving the overall performance of photovoltaic cells, improving the environmental protection and sustainability of the process, facilitating large-scale production, and having broad market application prospects.

[0025] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preventing oxidation of photovoltaic solar cell electrodes, characterized in that: The steps are: (1) printing copper paste on the indium tin oxide (ITO) thin film layer to form a copper layer; (2) Curing treatment: curing the copper layer formed by printing; (3) Inkjet printing: The insulating ink is loaded into the inkjet printing device, and the ink is evenly printed on the surface of the copper paste using the inkjet printing device to form a protective layer; (4) Secondary curing: Use ultraviolet light to cure the protective layer formed by inkjet printing to ensure that it has sufficient mechanical strength and insulation performance during use.

2. A method for preventing oxidation of photovoltaic solar cell electrodes according to claim 1, characterized in that: The copper paste printed in step (1) has a line width of 30-350 μm and a copper layer thickness of 10-25 μm.

3. A method for preventing oxidation of photovoltaic solar cell electrodes according to claim 1, characterized in that: The step (2) uses a nitrogen curing box to cure the copper layer in a nitrogen protection environment, the curing temperature is 120-230° C., and the curing time is 10-25 minutes.

4. A method for preventing oxidation of photovoltaic solar cell electrodes according to claim 1, characterized in that: The ink used in step (3) has a viscosity of 15-65 cp, a transmittance of not less than 90%, and an electrical conductivity of 500-7500 S / cm.

5. The method for preventing oxidation of photovoltaic solar cell electrodes according to claim 1, characterized in that: In the step (3), the ink layer is evenly printed by controlling the printing parameters of the nozzle speed, the jet pressure, and the printing path during inkjet printing. The ink layer is completely printed on the surface of the copper paste in a covering manner. The ink protection layer formed by printing has a height of 10-45 μm and a width of 100-250 μm.

6. A method for preventing oxidation of photovoltaic solar cell electrodes according to claim 1, characterized in that: The wavelength of the ultraviolet light in step (4) is 250-450nm, and the curing energy of the curing treatment operation is 300-5000mj / cm 2 .

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