| CPC C30B 15/20 (2013.01) [C30B 15/26 (2013.01); C30B 15/28 (2013.01); C30B 35/00 (2013.01); G05B 15/02 (2013.01)] | 18 Claims |
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1. A method for controlling crystal growth, comprising:
obtaining an actual crystal parameter in a target time slice, wherein the actual crystal parameter includes at least one of an actual crystal mass, an actual crystal diameter, an actual crystal height, or an actual crystal shape;
obtaining a reference crystal parameter in the target time slice, wherein the reference crystal parameter includes at least one of a reference crystal mass, a reference crystal diameter, a reference crystal height, or a reference crystal shape, wherein the obtaining a reference crystal parameter in the target time slice comprises:
constructing a crystal growth model based on a preset crystal parameter and a preset crystal growth parameter, and at least one of parameters involved in a crystal growth process including an internal stress, an internal defect, an internal component distribution, a continuity of different crystal growth stages, wherein the crystal growth model characterizes a theoretical growth condition of the crystal in an entire growth process; and
determining the reference crystal parameter corresponding to the target time slice based on the crystal growth model;
determining a temperature control parameter based on the actual crystal parameter and the reference crystal parameter;
determining a pulling control parameter based on the actual crystal parameter and the reference crystal parameter; and
adjusting a temperature and a pulling speed in a next time slice after the target time slice respectively based on the temperature control parameter and the pulling control parameter;
wherein the method further comprises:
obtaining a real-time image during a process of dropping the seed crystal;
comparing the real-time image with a preset reference image, including:
dividing the preset reference image and the real-time image into a plurality of corresponding regions, respectively;
for each region, comparing real-time image information with corresponding preset reference image information to determine a similarity, the image information including at least one of a size of a meniscus, a brightness of the meniscus, a size of a meniscus aperture, or a flow range of a flow line of a raw material liquid;
in response to that the similarity is greater than a preset similarity threshold, determining that there is no need to adjust the heating parameter; and
in response to that the similarity is less than or equal to the preset similarity threshold, adjusting the heating parameter.
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