All back contact solar battery and preparation method therefor, and assembly and system of solar battery

Abstract

The invention relates to an all back contact solar battery and a preparation method therefor, and an assembly and a system of the solar battery. The preparation method mainly comprises the following steps of performing texturing treatment on the front surface of an N type solar battery base body; putting the base body into an industrial diffusion furnace to perform boron diffusion on the texturing surface; preparing a pattern on the back surface by laser, corrosion slurry or a barrier layer to be used as a doping region; performing phosphorus atom injection on a TMAH etching region by an ion implanter on the back surface of a silicon wafer, and performing annealing treatment; removing an oxide layer from the front surface and the back surface; plating the front surface and the back surface of the silicon wafer with a silicon nitride film layer separately to prepare sectional metal electrodes to form ohmic contact with a base; and paving metal wires on the metal electrodes in a P region and an N region, and cutting redundant metal wires on the edge of the battery to obtain the solar battery. Beneficial effects of reducing surface compounding caused by silver-containing secondary gates and lowering of production cost of a metalizing program can be achieved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a full-back contact solar cell, the cell and its components, and a system. Background technique [0002] The full back contact solar cell is a high-efficiency semiconductor device that converts solar energy into electrical energy, but its metallization requires a large amount of precious metal materials. At present, the most commonly used metallization method in mass-produced solar cells is the screen printing metal paste method. By printing silver paste or aluminum-doped silver paste, after high-temperature sintering, the metallization method with electrical contact, electrical conduction, soldering and interconnection functions is formed. Metalization. In order to form a good ohmic contact and take into account solderability, silver paste or aluminum-doped silver paste is generally printed on the front surface of crystalline silicon solar cells, but ...

AI Technical Summary

Problems solved by technology

In order to form a good ohmic contact and take into account solderability, silver paste or aluminum-doped silver paste is generally printed on the front surface of crystalline silicon solar cells, but the price of silver paste or aluminum-doped silver paste is generally relatively expensive, resulting in silver-containing paste in The proportion of solar cell manufacturing cost remains high

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