Patent ID: 9605356
Date: 2017-03-28
CPC Classifications: C01B,C30B,G01N

Claim:
1. A method for selecting a polycrystalline silicon rod, the method comprising: obtaining one or more plate-like samples from a polycrystalline silicon rod grown by a chemical vapor deposition process, each of the one or more plate-like samples having a cross section perpendicular to a long axis direction of the polycrystalline silicon rod, wherein the cross section is a principal plane of each of the one or more plate-like samples; performing an X-ray diffraction measurement omnidirectionally in the principal plane of each of the one or more plate-like samples; and selecting the polycrystalline silicon rod as suitable for use in the production of single-crystalline silicon when none of the plate-like samples has any X-ray diffraction peak with a diffraction intensity deviating from an average value ±2×standard deviation found for any one of the Miller indices <111>, <220>, <311> and <400>.