Solar cell piece and preparation method thereof

Abstract

The invention provides a solar cell piece and a preparation method thereof. The preparation method comprises: a first back electrode is prepared on the back of a silicon wafer; an aluminum back field is prepared at the back, beyond the first back electrode, of the silicon wafer, wherein the n aluminum back field is in conduction with the first back electrode; a second back electrode is prepared on the first back electrode and the first back electrode and the second back electrode are combined to form a back electrode, so that the thickness of the back electrode is not less than that of the aluminum back field; and a front electrode is prepared on the front side of the silicon wafer. According to the solar cell piece prepared based on the preparation method, because the thickness of the back electrode is not less than that of the aluminum back field, the back electrode and a solder strip are in full contact during cell piece series welding, so that a problem that the back electrode can not be welded with the solder strip or insufficient soldering exists is solved; and a technical bottleneck of volume production of the solar photovoltaic assembly is solved and the industrialization target of the products is realized.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell sheet and a preparation method thereof. Background technique [0002] For multi-busbar solar cells, because the back electrode is designed in segments, the area of ​​the back electrode is small, the welding length of the back electrode in the direction of the ribbon laying is small, and the circular solder with a diameter of about 0.2mm to 0.4mm is used. With string welding (such as figure 1 shown). Therefore, it is very difficult to weld between the ribbon and the back electrode of the battery sheet, and it is easy to cause the back electrode and the ribbon to be welded incorrectly or to be welded incorrectly. [0003] The traditional solar cell screen printing production process is divided into three processes: one is back electrode screen printing, the other is back electric field screen printing, and the third is front grid screen printing. According to th...

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Problems solved by technology

[0005] Based on this, aiming at the problem that the soldering between the ribbon and the back electrode cannot be soldered or the soldering is false, the present invention provides a solar battery sheet and a preparation method thereof

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