A kind of n-type high-efficiency battery positive silver-aluminum paste

Abstract

The invention discloses an N-type high-efficiency battery positive silver-aluminum paste, which belongs to the field of materials. The product includes the following components in parts by weight: 83-95 parts of silver-aluminum powder mixture, 2-8 parts of glass frit, metal oxide 0.01~0.2 parts, 4~12 parts of organic carrier, 1~10 parts of AlB alloy and 0~1 part of boron powder; the silver powder and aluminum powder are included in the silver-aluminum powder mixture, and the mass ratio of the silver powder and aluminum powder is 1:78-85; the activity of the aluminum powder is 98-99.8%. By adding a certain amount of silver powder to the aluminum powder and limiting the high activity of the aluminum powder, the conductivity of the silver-aluminum paste can be improved and the contact resistance value can be reduced; by adding glass frit to the components, the passivation film on the surface of the battery can be effectively corroded The addition of metal oxide can balance the reaction degree of silver aluminum powder, passivation film and silicon; the addition of AlB alloy and boron powder can make the B element in the silver aluminum paste uniformly disperse and promote contact performance, and prepare P+ structure by sintering to improve conductivity . The invention also provides a preparation method of the product and an N-type high-efficiency battery prepared from the product.

Description

Technical field [0001] The present invention belongs to the field of material, and more particularly to a n-type high-efficiency battery front silver aluminum paste. Background technique [0002] After years of development, the crystal silicon solar cell has gradually improved, which has been previously passed from the earliest crystal silicon conventional solar cell, and then develops to the back passivated PERC battery. In the Perc battery, the metal electrode is still in direct contact with the silicon substrate, the contact interface of the metal and the semiconductor generates a band bend due to the power function adaptation, and produces a large number of mattometric composite centers, and there is a negative effect on the efficiency of the solar cell, so It has been proposed to use a film to separate the metal and silicon to reduce composite, but this structure principle has gradually started industrialization until recent years, and existing products have the following sh...

AI Technical Summary

Problems solved by technology

In the PERC cell, the metal electrode is still in direct contact with the silicon substrate, and the contact interface between the metal and the semiconductor will produce energy band bending due to work function adaptation, and generate a large number of minority carrier recombination centers, which will have a negative impact on the efficiency of the solar cell. People have long proposed to use a thin film to separate metal and silicon to reduce recombination, but batteries with this structural principle have only gradually begun to be industrialized in recent years, and existing products have the following disadvantages: (1) electrical properties Unstable, the difference in electrical performance between batches is 0.2%; (2) The overall electrical performance is not high enough, the average mass production efficiency is 23.8%, and the open circuit voltage is lower than 700mv; (3) The printing performance is poor, and false printing often occurs; (4) High contact resistance

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