A solar silicon wafer sorting system and method based on photoluminescence

Abstract

The invention discloses a solar silicon wafer sorting system and a solar silicon wafer sorting method based on photoluminescence. The system comprises a laser emitting device, a data acquisition device and a host computer, wherein the laser emitting device is electrically connected with the host computer and used for irradiating laser on the surface of a to-be-sorted silicon wafer, the data acquisition device is electrically connected with the host computer and used for acquiring fluorescence signals fed back by the to-be-sorted silicon wafer, and the host computer is used for analyzing the fluorescence signals, acquiring dislocation density information and impurity content information of the to-be-sorted silicon wafer, determining the grade of the silicon wafer and analyzing insufficiency in polycrystalline silicon ingot casting according to changes of dislocation density and impurity content of the silicon wafer during polycrystalline silicon ingot casting. With the system and the method provided by the invention, silicon wafers with different performances can be effectively sorted, low efficiency silicon wafers with high dislocation density or high impurity content can be removed, so influence of the low efficiency silicon wafers on transfer efficiency of a whole battery is prevented; meanwhile, adverse conditions in polycrystalline silicon ingot casting can be analyzed, and process optimization can be carried out on polycrystalline silicon ingot casting.

Description

technical field [0001] The invention relates to the technical field of polysilicon detection, in particular to a solar silicon wafer sorting system and method based on photoluminescence. Background technique [0002] For a long time, people have not made much breakthrough in polysilicon detection technology. During the production process of silicon wafers, it is not possible to sort and grade silicon wafers, and it is not known whether silicon wafers are efficient or inefficient. The potential conversion efficiency of solar cells made of silicon wafers is closely related to the quality of silicon wafers. Before the production of silicon wafers, only passing performance tests such as the existing appearance and minority carrier life cannot accurately reflect the potential performance of the silicon wafers. The electrical performance parameters of solar cells, resulting in poor electrical performance of the battery caused by low-efficiency silicon wafer sources. Contents of ...

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Problems solved by technology

[0002] For a long time, people have not made much breakthrough in polysilicon detection technology. During the production process of silicon wafers, it is not possible to sort and grade silicon wafers. It is not known whether silicon wafers are efficient or inefficient.

The potential conversion efficiency of solar cells made of silicon wafers is closely related to the quality of silicon wafers. Before the production of silicon wafers, only passing performance tests such as the existing appearance and minority carrier life cannot accurately reflect the potential performance of the silicon wafers. The electrical performance parameters of solar cells, resulting in poor electrical performance of the battery caused by low-efficiency silicon wafer sources

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