Glass powder, preparation method thereof and application of glass powder in TOPCon battery

Abstract

The invention discloses glass powder, and relates to the field of silver electrode slurry. The glass powder comprises the following components in parts by weight: 25-50 parts of lead oxide, 25-45 parts of tellurium oxide, 10-30 parts of bismuth oxide, 2-10 parts of molybdenum oxide, 0-6 parts of silicon dioxide, 0-6 parts of boron oxide, 0-4 parts of alkaline earth metal oxide, 0-6 parts of alkalimetal oxide and 0-3 parts of rare earth metal oxide. The invention further provides TOPCon battery silver paste containing the glass powder, the contact performance of the TOPCon battery silver pasteon thin Poly (60-100 nm) and metal compounding can be balanced, and the efficiency of a client is improved by 0.1% or above.

Description

technical field [0001] The invention relates to the field of silver electrode paste, in particular to a glass powder, a preparation method thereof and application in TOPCon batteries. Background technique [0002] Compared with P-type single crystal silicon, N-type single crystal silicon has the advantages of higher minority carrier lifetime, less boron-oxygen recombination, and less light-induced attenuation, so it has a higher room for efficiency improvement. At the same time, the N-type module has the advantages of low temperature coefficient and good weak light response. With new technologies and processes for batteries, the market share of N-type silicon is expected to reach about 40% in 2035. At present, the N-type high-efficiency batteries in the industry mainly include N-PERT, N-TOPCon, HJT and IBC batteries. Among them, N-PERT and TOPCon are highly compatible with PERC battery production lines. TOPCon batteries are one of the future trends. [0003] TOPCon technol...

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Problems solved by technology

[0004] The back electrode of the TOPCon battery is in contact with n+ polysilicon. The polysilicon layer is deposited by LPCVD or PECVD, and then crystallized into polysilicon by annealing. Unlike the polysilicon formed by ingot, the traditional silver paste is also less in contact with this layer. It is difficult to form a good ohmic contact. The traditional silver paste has the following disadvantages: when the polysilicon thickness on the back of the TOPCon battery is > 150nm, the contact performance and metal compounding of the common TOPCon back electrode on the market and the N+ layer of the TOPCon battery can be balanced; When the polysilicon thickness is less than 120nm (especially less than 100nm), it is difficult for ordinary TOPon silver paste to form a good contact with the thin polysilicon layer under the low temperature of the sintering furnace. Increasing the temperature of the sintering furnace can improve the contact performance, but High temperature will burn through the silicon dioxide layer, resulting in larger metal composites and lower electrical properties; when the back of TOPCon is a polished surface, it will affect the adhesion of the slurry after drying. Ordinary TOPCon silver paste will Partial peeling occurs, resulting in poor EL after sintering, which affects the appearance and efficiency of the battery. It is necessary to develop a special TOPCon battery back electrode paste

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