Back field aluminum paste composition of solar battery and preparation method thereof

Abstract

The invention relates to a back field aluminum paste composition of a solar battery, wherein the back field aluminum paste composition of the solar battery comprises the following components in percentage by weight: 70-76 percent of aluminum powder, 1-3 percent of glass binder phase and 20-30 percent of organic carrier, wherein the aluminum powder is formed by mixing fine aluminum powder with grain diameter of 3-5mum and coarse aluminum powder with grain diameter of 6-8mum in a predetermined mass ratio, and the grain diameter ratio of the fine aluminum powder to the coarse aluminum powder is greater than 0.414. In the back field aluminum paste composition of the solar battery and the preparation method thereof provided by the technical scheme of the invention, by reasonably designing the grain diameter ratio of the fine aluminum powder to the coarse aluminum powder, the stress generated in process of sintering is minimum, therefore, the purpose of reducing warping is realized.

Description

technical field [0001] The invention relates to the technical field of thick-film electronic paste composition, in particular to a solar cell back field aluminum paste composition and a preparation method thereof. Background technique [0002] Theoretically, the highest photoelectric conversion efficiency of monocrystalline silicon solar cells is 30%, and the highest efficiency of polycrystalline silicon solar cells is 24%. At present, the maximum conversion efficiency of monocrystalline silicon solar cells has been greatly improved in the laboratory, which is 24.7%, which is close to the maximum efficiency value. However, due to the existence of many grain boundaries in polycrystalline silicon solar cells, the recombination centers formed by these grain boundaries cause the photovoltaic conversion efficiency of polycrystalline silicon to be far lower than that of single crystal silicon, and the photoelectric conversion efficiency is 19.8%. The efficiency of industrial prod...

AI Technical Summary

Problems solved by technology

The currently known methods of reducing warpage all come down to a simple cancellation method, that is, adding a high-temperature stable oxide with an expansion coefficient such as ZrO to the slurry. 2 、TiO 2 , SiO 2 etc., but because these substances are insulators, to a certain extent, the contact resistance of the battery will increase, thereby reducing the conversion efficiency of the battery. At the same time, because the addition amount is very small, generally more than 1%, it is difficult to disperse them evenly in the process into the aluminum paste composition

[0008] In addition, the glass bonding phase in the aluminum paste of the prior art mostly uses high-lead glass, with a lead content of more than 70%, which causes great harm to the environment and the human body; at the same time, its organic carrier uses o-phenyl esters as solvents and plasticizers. Agents will not only cause deterioration of environmental pollution, but also endanger the health of directly or indirectly exposed people

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