Patent ID: 7507672
Filing Date: 2009-03-24
Classification: H01J,H01L

Abstract:
1. A method of plasma etching a device, the method comprising: positioning a device in a chamber; plasma etching the device, wherein the plasma etching includes providing a first alternating voltage waveform to the chamber, having first alternating peak voltages to the chamber so as to generate a plasma into a selected state; and dissipating charge accumulated on the device while plasma etching the device, wherein the dissipating charge includes periodically applying a second voltage waveform of a first polarity and having a second peak voltage to the chamber wherein the second peak voltage is greater than the first alternating peak voltage of the first polarity, and wherein the first voltage and the second voltage are selected so as to substantially maintain generation of the plasma into the selected state during the plasma etching process and the dissipating charge process.