Patent · US Active

Polycrystalline silicon chunks and method for producing them

US9266741B2 · kind B2 · utility

2Cited by

10References

3Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Hanns Wochner · Burghausen, DE
Laszlo Fabry · Burghausen, DE

Key dates

Filing date	Jul 26, 2013
Grant date	Feb 23, 2016
Priority date	—
Expiry date	May 30, 2034

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2982
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention relates to polycrystalline silicon chunks which are cubic and have a metal content of less than 200 pptw and a dopant content of less than 50 ppta. Methods for producing polycrystalline silicon chunks, include the steps of providing a polycrystalline silicon rod, comminuting the polycrystalline silicon rod into cubic chunks, and cleaning the polycrystalline silicon chunks, wherein comminution takes place using a spiked-roll crusher having at least one spiked roll, the spiked roll including W2C phases or WC phases with 0.1-10% of a metal carbide selected from the group consisting of titanium carbide, chromium carbide, molybdenum carbide, vanadium carbide, and nickel carbide or consisting of steel with 1-25% W.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.