Patent ID: 6037267
Filing Date: 2000-03-14
Classification: H01L

Abstract:
A method of etching metallic film for a semiconductor device, comprising:inserting a semiconductor substrate with a metallic film exposed in a film pattern onto a chuck in a chamber of an electrostatic shielded radio frequency (ESRF) inductive-coupled plasma source, the ESRF inductive-coupled plasma source also including a coil connected to an upper electrode, a lower electrode connected to the chuck, a gas supply assembly, a pressure control assembly and a temperature control assembly;supplying an etching gas to the chamber at an etch gas supply rate;maintaining pressure inside the chamber at a pressure level;powering the upper electrode with an upper power at an upper RF;powering the lower electrode with a lower power at a lower RF;cooling the chamber walls to a temperature; andetching the metallic film such that trenches in the metallic film are formed with trench qualities including a trench critical dimension no greater than a critical dimension associated with large scale integration.