Chained polycrystalline acid etching automatic weighing device

Abstract

The invention relates to the field of crystalline silicon solar cells, in particular to a chained polycrystalline acid etching automatic weighing device, which comprises a weighing mechanism and a reading mechanism. The weighing mechanism comprises a first weighing device and a second weighing device; the first weighing device is disposed at a feeding end; the second weighing device is disposed ata discharging end; both the first weighing device and the second weighing device are connected with the reading mechanism; the reading mechanism respectively obtains values of the first weighing device and the second weighing device; and the value of the first weighing device minus the value of the second weighing device is an etching weight reduction number of a silicon wafer. By using chained polycrystalline acid etching automatic weighing device in the invention, the real-time etching weight reduction of the silicon wafer in an etching tank can be obtained conveniently and quickly; convenience is brought for process personnel to control the stability of the production line, thereby improving the difference caused by unstable etching and finally improving the yield rate without specially setting up manual weighing by operators; the degree of automation is high, the result is accurate, time and effort are saved, the working efficiency is high, and broad application aspect is achieved.

Description

technical field [0001] The invention relates to the field of crystalline silicon solar cells, in particular to an automatic weighing device for chain polycrystalline acid etching. Background technique [0002] The etching and polishing process of solar cells is a crucial step in the manufacturing process of high-efficiency solar cells. It has a significant impact on the electrical properties of the finished cells and the EL yield rate. The uniformity of the back reflectivity of the silicon wafer after etching determines the The uniformity of the chemical coating, the uniformity of the coating determines the uniformity of the laser opening rate and size. Therefore, etching plays a pivotal role in the entire production process of crystalline silicon solar cells. [0003] Chain polycrystalline acid etching is a common method in the solar cell manufacturing process. The existing chain polycrystalline acid etching equipment mainly uses 5-8-10 channels to run at the same time. We...

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Problems solved by technology

Although this method can improve the difference caused by etching instability to a certain extent, because the existing weighing method is manual weighing, this operation method is not only time-consuming and laborious, but also labor-intensive and low-efficiency. It is very easy to cause visual fatigue due to long-term work, resulting in missing weighing. More importantly, due to the differences between different weighing personnel in the manual weighing method, the weighing results are poorly uniform and affect the product yield.

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