PROCESS FOR THE PREPARATION OF POLYCRYSTALLINE SILICON

摘要

Siemens reactors for polysilicon deposition may employ faster and/or more economical deposition conditions without reduction in yield, by pre-sorting polysilicon rods into different quality classifications prior to comminution, and further sorting the polysilicon fragments in each classification into further classifications.

主权项

1. A process for producing polycrystalline silicon, comprising depositing polycrystalline silicon on support bodies present in at least one reactor to obtain polycrystalline silicon rods, deinstalling the polycrystalline silicon rods from the at least one reactor, and comminuting the deinstalled polycrystalline silicon rods into chunks, wherein the deinstallation of the polycrystalline silicon rods from the at least one reactor is followed by, and the comminution of the deinstalled polycrystalline silicon rods into chunks is preceded by, classification of the polycrystalline silicon in rod form into at least two quality classes on the basis of at least one classification feature, said at least two quality classes being sent to separate further processing steps.