Patent ID: 7204935
Filing Date: 2007-04-17
Classification: C03C,C23C

Abstract:
1. A method for etching copper films on a substrate, the method comprising the steps of: a. placing a substrate having a temperature in the range of 120° C. to 300° C. and comprising an upper surface, a lower surface, and silicon in a reaction cell, wherein at least one of said surfaces is coated with a copper layer; b. injecting an oxidizing agent into the cell through the use of a carrier gas during a first pulse of 1–20 seconds duration; c. injecting a purge pulse comprising an inert gas into the cell during a second pulse of 1–10 seconds duration; d. injecting a reducing agent into the cell during a third pulse of 1–10 seconds duration; and e. injecting an inert gas into the cell during a fourth pulse of 1–10 seconds duration, wherein the steps a. through e. are sequentially performed over time.