Wet etching method and device for solar cells

Abstract

The invention provides a wet etching method and device for solar cells. The wet etching device comprises an etching tank, a first washing tank, an alkaline washing tank, a second washing tank, a pickling tank and a third washing tank. An inlet and an outlet of the first washing tank are provided with a first water jet cutter and a second water jet cutter respectively. The wet etching device further comprises a first liquid storage tank and a second liquid storage tank which are connected with the third washing tank and the second water jet cutter through connecting pipelines, respectively.as liquid in the third washing tank reaches a preset water level, redundant liquid is discharged into the second liquid storage tank which supplies the liquid for the second water jet cutter. The first liquid storage tank is connected with the first washing tank and the etching tank respectively through the connecting pipelines. The first washing tank supplies the liquid for the first water jet cutter. As the liquid in the first washing tank reaches the preset water level, the redundant liquid is discharged into the first liquid storage tank used for supplying water and distributing liquid for the etching tank. By the use of the wet etching method and device, nitrogenous waste water discharge is reduced, and production cost is lowered.

Description

technical field [0001] The invention belongs to the field of solar cells, and relates to a wet etching method and device for solar cells. Background technique [0002] A common crystalline silicon solar cell is composed of a back electrode, a P-type layer composed of semiconductor materials, an N-type layer, a P-N junction, an anti-reflection film, and a front gate electrode. When sunlight hits the surface of the solar cell, the anti-reflection film and textured structure can effectively reduce the light reflection loss on the surface of the cell. After the semiconductor structure in a solar cell absorbs solar energy. The electrons and holes are excited to generate pairs of electrons and holes. The electrons and holes are separated by the self-built electric field of the P-N junction inside the semiconductor. The electrons flow into the N region and the holes flow into the P region to form a photo-generated electric field. When connected with an external circuit, there is ...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a wet etching method and device for solar cell sheets, which is used to solve the problem of a large amount of solar cell sheet wet etching method and device in the prior art producing Nitrogen wastewater makes the treatment cost relatively high and raises the production cost of solar cells

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