Positive conductive silver paste of silicon solar cell and preparation method of positive conductive silver paste

Abstract

The invention is applicable for the field of a silicon solar cell, and provides a positive conductive silver paste of a silicon solar cell and a preparation method of the positive conductive silver paste. The positive conductive silver paste of the silicon solar cell comprises silver powder, a glass filler and an organic carrier and also comprises rod-like nanometer silver threads and inorganic salt compound crystals, wherein the glass filler is a modified TeO2-Bi2O3-PbO glass filler, the silver powder is micro / submicro silver powder, and based on 100% of total weight of the positive conductive silver paste of the silicon solar cell, the constituents in percent by weight are as follows: 60-90% of micro / submicro silver powder, 0.1-10% of rod-like nanometer silver threads, 0.1-10% of modified TeO2-Bi2O3-PbO glass filler, 0.1-10% of inorganic salt compound crystals and 5-20% of organic carrier. By the positive conductive silver paste of the silicon solar cell, the contact resistance of the silver paste and a cell piece is reduced, and meanwhile, the photoelectric conversion efficiency and the peel strength of the silicon solar cell piece are effectively improved.

Description

technical field [0001] The invention belongs to the field of silicon solar cells, in particular to a front conductive silver paste of a silicon solar cell and a preparation method thereof. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Its working principle lies in the photovoltaic effect of the semiconductor PN junction. A wire that, when turned on, forms an electrical current for use by an electrical device or stored by a charge storage device. In a solar cell, in order to utilize the electrons generated by the photovoltaic effect in the cell, electrodes must be used to export the electrons. [0003] Currently, the most mature solar cells on the market are silicon solar cells. The electrodes on the surface of silicon solar cells mainly include back silver electrodes and front silver electrodes. These electrodes are usually formed by printing conductive silver paste on the surface of silicon wafers b...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a front conductive silver paste of silicon solar cells with high photoelectric conversion efficiency and high welding tension, aiming at solving the problem of tellurium-containing glass frits, especially those containing tellurium, under the premise of ensuring the electrical properties of the front conductive silver pastes of silicon solar cells. TeO 2 -Bi 2 o 3 -The problem of low adhesion and poor silicon affinity of the conductive silver paste glass frit on the front side of the silicon solar cell with PbO glass frit, so as to improve the TeO-containing 2 -Bi 2 o 3 -Short-circuit current, open-circuit voltage, and conversion efficiency of the conductive silver paste on the front of the silicon solar cell of the PbO glass frit, and reduce the series resistance of the conductive silver paste on the front of the silicon solar cell

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