Patent ID: 8134134
Filing Date: 2012-03-13
Classification: H01J

Abstract:
1. A particle attachment preventing method in a substrate processing apparatus including an accommodation chamber configured to accommodate a substrate therein and generate a plasma therein, a mounting table configured to mount the accommodated substrate thereon, a first power supply configured to supply a bias power for attracting the plasma to the mounting table, and a second power supply configured to supply an electron density control power for controlling an electron density above the substrate, the method comprising: adjusting the electron density control power supplied from the second power supply such that the electron density above the substrate gets lower than during a plasma processing, for a preset short period of time after the plasma processing is ended; and maintaining the bias power supplied from the first power for the preset short period of time, wherein the preset short period of time is about 0.5 to 1.0 second.