Process for etching positive surface of cadmium telluride solar panel

Abstract

The invention discloses a process for etching the positive surface of a cadmium telluride solar panel. The process is characterized in that the upper end surface of the cadmium telluride solar panel is covered with a cover sheet; splashed or volatilized concentrated nitric acid acts on the cover sheet during the etching process of the positive surface so as to protect the diaphragm surface of the cadmium telluride solar panel while not affecting the etching of the lower end of the cadmium telluride solar panel. The cover sheet can be a corrosion-resistant thin plate made of glass so long as the diaphragm surface is covered. The process is easy to operate. The material is easy to obtain and low in price, thereby reducing the production cost and improving the production efficiency and product quality.

Description

technical field [0001] The invention belongs to the technical field of solar cell manufacturing, and in particular relates to a process for etching the positive surface of a cadmium telluride solar cell panel. Background technique [0002] In the current manufacturing process of cadmium telluride solar panels, there is a positive etching process, which is a wet etching process, that is, using concentrated nitric acid to etch away the tellurium plated on the substrate glass surface of the solar panel. Cadmium telluride and cadmium sulfide, to avoid contact between cadmium telluride or cadmium sulfide plated on the glass surface of the substrate and the front surface of the cadmium telluride film, resulting in low conversion efficiency of the battery, and etching on the positive side can also ensure that the battery has good looks. However, in the actual production process, because concentrated nitric acid is extremely volatile, the volatile acid gas will also corrode the cad...

AI Technical Summary

Problems solved by technology

[0002] In the current manufacturing process of cadmium telluride solar panels, there is a positive etching process, which is a wet etching process, that is, using concentrated nitric acid to etch away the tellurium plated on the substrate glass surface of the solar panel. Cadmium telluride and cadmium sulfide, to avoid contact and communication between cadmium telluride or cadmium sulfide plated on the glass surface of the substrate and the front surface of the cadmium telluride film, resulting in low conversion efficiency of the battery, and etching on the positive side can also ensure that the battery has good appearance

However, in the actual production process, because the concentrated nitric acid is extremely volatile, the volatile acid gas will also corrode the cadmium telluride film surface on the front of the battery to form white spots, and when the positive surface of the transmission battery is etched, the rollers of the transmission It is very easy to splash concentrated nitric acid and drop on the front of the battery, thereby corroding the surface of the cadmium telluride film, which is not conducive to the appearance of the product and the conversion efficiency

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