Double-sided solar cell and manufacturing method thereof

Abstract

The invention discloses a method for manufacturing a double-sided solar cell, and the method comprises the steps: obtaining a preprocessing silicon wafer with a diffusion layer formed on the front surface, and enabling the front surface and back surface of the preprocessing silicon wafer to have pyramid suede structures; removing phosphorosilicate glass on the back surface of the preprocessing silicon wafer, and cleaning the preprocessing silicon wafer from which the phosphorosilicate glass is removed to obtain a cleaned silicon wafer; sequentially forming an oxide layer and a first passivation layer which are superposed on the front surface of the cleaned silicon wafer to obtain a treated silicon wafer; removing the winding plating oxide layer and the winding plating passivation layer onthe back surface of the treated silicon wafer by using a hydrofluoric acid solution, and removing the diffusion layer and texturing on the back surface of the treated silicon wafer by using an alkaline solution to obtain a retreated silicon wafer; forming a second passivation layer on the back surface of the retreated silicon wafer, and slotting the second passivation layer to obtain a battery precursor; forming electrodes on a front surface and a back surface of the battery precursor to obtain the double-sided solar cell, thereby effectively improving the double-sided rate of the cell and reducing the color difference between the front surface and the back surface.

Description

technical field [0001] The present application relates to the technical field of solar cells, in particular to a double-sided solar cell and a manufacturing method thereof. Background technique [0002] PERC (passivated emitter and rear contact, passivated emitter and rear contact) battery has become a research hotspot in the photovoltaic industry because of its good back passivation structure, which can improve the opening voltage and short-circuit current of the battery. [0003] At present, when preparing PERC double-sided solar cells, after the front side of the silicon wafer is diffused to form a pyramid structure, the PSG on the back side is removed by acid etching and the back side is polished, because acid etching is used on the back side. , so that the back reflectivity of the silicon wafer is high, and the light trapping ability is poor, which leads to the low efficiency of the back of the battery. , instead of a pyramid structure, that is, it is different from th...

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Problems solved by technology

[0003] At present, when preparing PERC double-sided solar cells, after the front side of the silicon wafer is diffused to form a pyramid structure, the PSG on the back side is removed by acid etching and the back side is polished, because acid etching is used on the back side. , so that the back reflectivity of the silicon wafer is high, and the light trapping ability is poor, which leads to the low efficiency of the back of the cell. , instead of a pyramid structure, that is, it is different from the type of structure on the front, resulting in a large difference in the appearance of PERC double-sided solar cells

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