Method for evaluating crystallinity of polycrystalline silicon
An evaluation method, polycrystalline silicon technology, applied in the direction of crystal growth, polycrystalline material growth, chemical instruments and methods, etc., can solve problems such as non-uniform melting, melting dependence on size, etc.
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[0081] Prepare 13 polysilicon rods grown under different precipitation conditions. For these polysilicon rods (silicon rods 1 to 13), each from Figure 1A with 1B For the three positions shown, select disc-shaped samples (20 mm) with a thickness of about 2 mm. CTR 、20 EDG 、20 R / 2 ),pass Image 6 With the measurement system shown, the φ scanning diagrams of the Miller index surfaces and are obtained. In addition, the diameter of the disk-shaped sample 20 was about 20 mm.
[0082] It should be noted that the selection position of the plate sample is not limited to Figure 1A with 1B The three positions shown are, for example, positions within R / 3 from the center of the polysilicon rod of radius R, positions within 1R / 3 to 2R / 3, positions greater than 2R / 3 and within 3R / 3. three places.
[0083] Table 1 (Example) and Table 2 summarize the diffraction intensities of the baselines of each disk-shaped sample obtained from these polycrystalline silicon rods, an...
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