Production process: slicing, cleaning, preparing suede, peripheral etching,solar panel removing the back PN+ junction, making upper and lower electrodes, making anti-reflection film, sintering, testing and grading,solar panel etc. 10 steps. The specific manufacturing process description of solar cells. Slicing: Using multi-line cutting,solar panel the silicon rod is cut into square silicon wafers. Cleaning: Use conventional silicon wafer cleaning methods to clean,solar panel and then use acid (or alkali) solution to remove 30-50um from the cut damage layer on the surface of the silicon wafer. Preparation of suede: anisotropically etch the silicon wafer with alkali solution to prepare suede on the surface of the silicon wafer. Phosphorus diffusion: Coating source (or liquid source,solar panel or solid phosphorous nitride sheet source) is used for diffusion to form a PN+ junction. The junction depth is generally 0.3-0.5um.
Peripheral etching: The diffusion layer formed on the peripheral surface of the silicon wafer during diffusion will short-circuit the upper and lower electrodes of the battery. The peripheral diffusion layer is removed by masked wet etching or plasma dry etching. Remove the back PN+ junction. Commonly used wet etching or grinding method to remove the backside PN+ junction. Making upper and lower electrodes: using vacuum evaporation,solar panel electroless nickel plating or aluminum paste printing and sintering processes. First make the bottom electrode,solar panel then make the top electrode. Aluminum paste printing is a widely used process method.
Fabrication of anti-reflection film: In order to reduce the incident reflection loss,solar panel a layer of anti-reflection film should be covered on the surface of the silicon wafer. The materials for making anti-reflection film include MgF2, SiO2, Al2O3, SiO, Si3N4, TiO2, Ta2O5,solar panel etc. The process method can be vacuum coating method, ion coating method, sputtering method,solar panel printing method, PECVD method or spraying method, etc. Sintering: Sintering the battery chip on a nickel or copper base plate. Test classification: According to the specified parameter specification,solar panel test classification.