Solar cell with rear passivation structure and manufacturing method thereof

Abstract

The invention discloses a solar cell with a passivation structure on the back and a manufacture method thereof. The solar cell with the passivation structure on the back comprises a substrate, a passivation layer, a first metal electrode and a second metal electrode. The passivation layer is formed on a backlight side of the substrate, and the first metal electrode and the second metal electrode are formed on a first area and a second area of the passivation layer respectively. A procedure of process of etching the passivation layer is reduced for the solar cell, and photoelectric conversion efficiency can be improved.

Description

technical field [0001] The invention relates to a solar cell and a manufacturing method thereof, in particular to a solar cell with a back passivation structure and a manufacturing method thereof. Background technique [0002] Due to the enhancement of environmental awareness and the gradual depletion of other petrochemical energy sources, the development of safe new energy sources has become the most urgent task at present. The new energy that can be used for development needs to meet two requirements at the same time: the new energy is rich in reserves and not easy to be exhausted; and the new energy is safe and clean, and will not threaten human beings or damage the environment. However, renewable energy sources such as solar energy, wind power, water power, etc. just meet the aforementioned requirements. In addition, Taiwan lacks energy resources, and more than 90% of its energy must be imported from abroad. However, Taiwan is located in the subtropical zone, with abund...

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Problems solved by technology

[0005] However, in the aforementioned U.S. patent application (2011 / 0120552 A1), when the silver glue 230 is in contact with the backlight surface of the substrate 200, due to the temperature limitation of the solar cell sintering process, there is no contact between the silver and the silicon of the substrate. Form a good alloy structure, so that the interface properties here will lead to an increase in the surface recombination velocity (SRV: Surface Recombination velocity) of the solar cell

In other words, due to the increase in the combination rate of electrons and holes generated in the photoelectric conversion effect, the photoelectric conversion efficiency decreases.

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