Method for preparing crystalline silicon solar cell with passivation on double surfaces

Abstract

The invention discloses a method for preparing a crystalline silicon solar cell with passivation on double surfaces. The method comprises the following steps: laminated passivation layers are prepared on the front and the back surfaces of the solar cell; by utilizing a method of screen printing corrosive sizing agent on the laminated passivation layer on the back surface, an electrode window is opened on the laminated passivation layer on the back surface; and then a back electrode is formed by screen printing or sputtering on the electrode window. By utilizing the screen printing corrosive sizing agent method, a structure of passivation on double surfaces of the solar cell is achieved; the structure greatly improves long-wave responses of the solar cell, and increases the conversion efficiency of the solar cell; and meanwhile, as an all-aluminium back surface field is cancelled and a local aluminum back surface field is adopted, bending of the solar cell is reduced and the structure is more suitable for the trend of solar cell thin section. As the method utilizes screen printing technique to replace pholithography and a laser sintering method, production costs are saved. Furthermore, the method is more suitable for mass production.

Description

technical field [0001] The invention relates to the field of photovoltaic utilization of solar energy, in particular to a preparation method of a crystalline silicon solar cell. Background technique [0002] The current commercial solar cell production process is simple and the manufacturing cost is relatively low. Its production process is as figure 1 Shown: Remove the damaged layer on the surface of the silicon wafer, make the textured surface → in POCl 3 Diffusion of P in the atmosphere to form n + Diffusion layer → use plasma etching or wet etching to remove the PN junction around the silicon wafer → use PECVD technology to deposit SiNx anti-reflection film on the front → screen print the back electrode, back electric field, and positive electrode → form by sintering in a sintering furnace Ohmic contact → test sorting. This commercial solar cell manufacturing technology is relatively simple, low in cost, suitable for industrialized and automated production, and thus ...

AI Technical Summary

Problems solved by technology

Due to the use of photolithography, laser and other equipment, it is expensive and not suitable for large-scale and low-cost industrial production of solar cells

Images