Patent ID: 6239036
Filing Date: 2001-05-29
Classification: H01J,H01L

Abstract:
A plasma etching apparatus for plasma etching the surface of a silicon substrate opposite the circuit-side surface of said substrate on one of parallel plate electrodes disposed oppositely to each other in a treatment chamber,said plasma etching apparatus comprising gas supplying means for supplying a mixed gas including oxygen and a fluorine gas in said treatment chamber, and setting means for setting a distance L between said parallel plate electrodes,wherein plasma discharge is conducted between said parallel plate electrodes on a condition that the product PL of a distance L between said electrodes and the pressure P of said mixed gas in said treatment chamber takes a value within 2.5Pa.multidot.m to 15Pa.multidot.m; andwherein the plasma etching rate of said substrate is over one micron per minute, and wherein said distance L is a value between 3 mm to 7 mm.