Method for preparing antapex contact crystalline silicon solar cell by utilizing passivation on double surfaces and laser dotting

Abstract

The invention discloses a method for preparing an antapex contact crystalline silicon solar cell by utilizing passivation on double surfaces and laser dotting. In the method, on the basis of a conventional crystalline silicon solar cell preparation process, both the front and the back surfaces of the solar cell are passivated; then a passivation layer on the back surface of the solar sell is quickly dotted by lasers, and then a back electrode local contact window is formed; and after screen printing or electrode magnetron sputtering, the antapex contact crystalline silicon solar cell with relative high efficiency is prepared. The method utilizes the technology of directly opening a passivation layer window by lasers, so that whether compared with traditional photolithography or a laser burning thawing aluminum electrode method, process steps, process time and preparation costs of the method are greatly reduced; screen printing and the mode of using magnetron sputtering to prepare back electrode adopted by the method are highly beneficial to mass production; and especially, screen printing has a low cost and a high output, and is consistent with the current production line, thereby profitably pushing the industrialization of screen printing.

Description

technical field

[0001] The invention belongs to the field of solar cell manufacturing, and in particular relates to a preparation method of a crystalline silicon solar cell. Background technique

[0002] Energy shortage and environmental degradation force countries around the world to actively seek green and renewable energy that can replace conventional energy. As an important part of renewable energy, photovoltaic power generation has achieved great development in recent years. In 2007, the global solar cell production reached 4.28GW, an increase of 69% over 2006, and the growth rate in 2008 was even greater. The development of China's photovoltaic industry was particularly strong. Notably, since 2007, the total output has ranked first in the world. However, compared with foreign advanced preparation technologies, my country's crystalline silicon solar cell preparation technology is still relatively backward. The basic process is as follows: figure 1 As shown, it is comp...

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