A kind of solar cell with ag transparent film and its preparation method

Abstract

The invention discloses a solar cell provided with an Ag transparent thin film and a preparation method for solar cell. The preparation method comprises the following steps: a) performing texturing on the front surface of a silicon wafer; b) performing diffusion on the silicon wafer to prepare a p-n junction; c) removing phosphorosilicate glass; d) depositing an anti-reflection film on the front surface of the silicon wafer; e) performing silk-screen printing on the back surface of the silicon wafer to form an Ag back electrode and an Al back electric field on the back surface of the silicon wafer; f) performing silk-screen printing on the front surface of the silicon wafer to form an Ag main grid line on the front surface of the silicon wafer; g) performing high-temperature sintering on the silicon wafer processed by the above steps; and h) performing Ag transparent thin film deposition on the front surface of the silicon wafer. Compared with the prior art, the preparation method provided by the invention has the advantages that the lateral resistance is greatly reduced, the collection capacity of current is improved, the shading area is not obviously enlarged, and the conversion efficiency of the current is greatly improved. The invention also provides the solar cell provided with the Ag transparent thin film.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell provided with an Ag transparent thin film and a preparation method thereof. Background technique [0002] A solar cell is an optoelectronic device that uses sunlight to directly generate electricity. When the sun shines, the solar cell can output voltage instantly and generate current when there is a loop. The electrical current of the solar cell is collected through metal electrodes. Metal electrodes can be divided into back electrodes and front electrodes, and the front electrodes are composed of main grid lines and auxiliary grid lines. The width of the auxiliary grid lines is generally 40-70 microns, and the number is 80-120, and the auxiliary grid lines are distributed parallel and evenly on the front of the solar cell; the main grid lines and the auxiliary grid lines are vertical, generally 3-5 and parallel and evenly distributed , with a width of 0.9-1.5...

AI Technical Summary

Problems solved by technology

[0003] Due to the shading effect, the smaller the area of ​​the front electrode, the better; reducing the number and width of the auxiliary grid lines can reduce the area of ​​the front electrode, but the increase in the lateral resistance and electrode resistance will lead to an increase in the series resistance of the solar cell, and at the same time the current collection capacity Decrease, will greatly reduce the conversion efficiency of the battery

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