Patent ID: 7871853
Filing Date: 2011-01-18
Classification: H01J,H01L

Abstract:
1. A plasma doping method comprising a step for contacting plasma to a sample within a vacuum chamber and for causing ions contained in the plasma to collide with a surface of the sample so as to quality-change the surface of the sample from a crystal state into an amorphous state thereof; comprising: a step (A) of determining a plasma doping time range; and a step (B) of quality-changing the surface of the sample from the crystal state into the amorphous state by using a predetermined plasma doping time range contained in the plasma doping time range, after the step (A); wherein the step (A) includes a step of respectively calculating an ion density at a plurality of portion within the surface of the sample; wherein the plasma, a standard deviation of density is equal to or smaller than 9.6%; and a time range, in which a depth of the amorphous layer formed on the surface of the sample that is corresponded to a portion whose ion density is smallest among the respective ion density is larger than or 90% of a depth of the maximum value that can be obtained while equal to or a shorter time than 60 seconds, and which is equal to or shorter time than 60 seconds, is determined as the predetermined plasma doping time range.