Preparation method of solar cell with back electrode point contact structure

Abstract

The invention discloses a preparation method of a solar cell with a back electrode point contact structure. The method comprises the steps of cleaning and felting an n-type or p-type solar cell plate, diffusing and knotting the felted cell plate, passivating the front surface and the rear surface of the diffused and knotted cell plate, annealing the passivated cell plate, conducting laser ablation on the back of the cell plate, conducting aluminum slurry screen printing and drying on the back of the cell plate, conducting silver electrode screen printing and drying on the front surface of the cell plate, and sintering the dried cell plate. The method can be combined with the existing cell preparation technology; compared with the traditional aluminum slurry screen printing contact mode, a back point contact electrode prepared by the method can be contacted with a silicon face better; and the ohmic contact is reduced. In addition, the method is simple in preparation technology and better in technology stability.

Description

technical field [0001] The invention relates to the field of manufacturing high-efficiency crystalline silicon solar cells, in particular to a method for preparing a high-efficiency and low-cost solar cell with a back electrode point contact structure. Background technique [0002] The innovation of energy technology drives the progress of human society, a series of technological inventions from "steam engine" to "electric motor" are a good illustration of this point. But so far, most of our energy and power bases are based on fossil fuels. Although it makes civilization develop and progress, it also brings a lot of environmental problems. And environmental protection issues have made us aware of the urgency of the problem, so a series of environmentally friendly resources such as solar cells will be a necessary trend and development requirement for future development. [0003] Although crystalline silicon cells have been developed for more than half a century, there are st...

AI Technical Summary

Problems solved by technology

[0005] And the method of laser ablation and dotting to realize the point contact structure of the back electrode is only carried out in the last few steps of battery preparation, which will not have any impact on the current manufacturing process on the market, and only adds a simple step of laser ablation and dotting. , but it plays a non-negligible role in improving the battery efficiency

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