Preparation method of solar cell and solar cell

Abstract

The invention provides a preparation method of a solar cell and the solar cell, and relates to the technical field of solar photovoltaics. After a silicon substrate is provided, a first passivation layer and a first transmission layer are sequentially deposited on one face of the silicon substrate, and the conduction type of the first transmission layer is different from that of the silicon substrate; a mask is arranged on the first transmission layer, the silicon substrate is arranged in an interdigital mode between a covering area and an uncovering area of the mask, the first passivation layer and the first transmission layer are etched according to the mask, and then a second passivation layer and a second transmission layer are sequentially deposited on the mask; and after the mask is removed, forming two transmission layers in interdigital back contact arrangement on one surface of the silicon substrate. At the moment, only one-time etching and one-time mask setting occur in the process, so that the process steps are effectively simplified, the preparation cost is reduced, the problem of inaccurate alignment precision is avoided, and the quality of a finished product is improved.

Description

technical field [0001] The invention relates to the field of solar photovoltaic technology, in particular to a method for preparing a solar cell and the solar cell. Background technique [0002] Crystalline silicon-amorphous silicon heterojunction (Silicon Hetero-Junction, SHJ) cell is a solar cell with symmetrical structure, high open circuit voltage, low process temperature, good temperature characteristics, stable light and high bifacial rate. The advantages are widely applied. At the same time, in order to increase the short-circuit current of the SHJ cell and avoid losses caused by light-incident grid lines, transparent conductive films, and amorphous silicon, back-contact heterojunction solar cells can be used, and the electrodes placed on the back of the cell can effectively reduce the short-circuit current loss. . [0003] Back-contact heterojunction solar cells require both an electron transport layer and a hole transport layer on the back of the cell. The two tra...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that in common processes, at least two etchings are usually required, or at least two masks are placed, and repeated etching of different patterns or replacement of different masks makes the process steps more complicated and costly, and there may also be The problem of low alignment accuracy affects the quality of finished products

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