Low-melting glass powder of crystalline silicon solar energy battery front side silver paste and preparation method thereof

Abstract

The invention provides a low-melting glass powder of crystalline silicon solar energy battery front side silver paste, and the powder is processed from the following substances in percentage by weight: 30-60% of PbO, 10-30% of B2O3, 5-30% of ZnO, 5-14% of SiO2, 0.5-2% of Li2O, 0.5-2% of Ag2O, 1-5% of MgO and 1-10% of ZrO. The preparation method comprises the following steps: 1. weighing materials, and uniformly mixing the materials in a ceramic mortar; 2. pouring the mixed powder into a corundum crucible, covering the crucible with a cover, and placing the crucible into a muffle furnace for fusion at an assigned furnace temperature; 3. carrying out water quenching of the fused glass liquid; 4. carrying out a drying; 5. milling and crushing the glass material after water quenching. The prepared glass powder has a suitable softening temperature, and has a good wetting capability for silver and silicon, simultaneously the glass contains silver oxide, and thereby better conveying and precipitating silver crystal grains in the sintering process, obtaining more contact points, improving the generation probability of tunnel effect, and reducing the contact resistor. Because the lead content is low, corrosion to silicon is reduced and possibility for breakdown of PN junction is effectively decreased, and thereby improving photoelectric conversion efficiency and life of solar energy battery in the prerequisite for guarantying the contact resistor.

Description

technical field The invention relates to electronic materials, in particular to a glass powder used for front silver paste of crystalline silicon solar cells and a preparation method thereof. Background technique Solar power generation has many incomparable advantages. Solar energy has the characteristics of abundant resources and inexhaustible use. At the same time, solar power generation equipment has a simple structure, easy installation and transportation, short construction period, simple maintenance, convenient use and safety. Moreover, there is no need to consume fuel during the power generation process, and there are no mechanical rotating parts, which will not cause any pollution and damage to the environment. Therefore, solar power generation has obvious economic benefits. Crystalline silicon solar cell power generation is still the main way of solar power generation due to its high conversion efficiency, long life and low cost. The metallization of the front ...

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Problems solved by technology

However, in practical applications, it is found that the lead-free glass system is difficult to obtain similar performance to the lead-containing glass system.

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