Patent ID: 9074299
Filing Date: 2015-07-07
Classification: C01B,C01P,C30B,Y10T

Abstract:
1. A polycrystalline silicon rod comprising a seed rod made of polycrystalline silicon, and a polycrystalline silicon deposit which is deposited on an outer circumferential surface of the seed rod by the CVD process, wherein a diameter of the polycrystalline silicon rod is 77 mm or less, wherein when the polycrystalline silicon rod is observed by an optical microscope with respect to across section perpendicular to an axis of the seed rod, needle-shaped crystals each having a length of 288 μm or less are uniformly distributed radially with the seed rod being as the center in the polycrystalline silicon deposit, and wherein said needle-shaped crystals account for 78% or more area of the cross section.