Patent ID: 6284146
Filing Date: 2001-09-04
Classification: C23F,H01L

Abstract:
A method for etching a transition metal thin film, comprising the steps of:(a) loading a semiconductor substrate having the transition metal thin film in a reaction chamber, wherein the transition metal thin film is a ferroelectric capacitor electrode film selected from the group consisting of Ru, Ir, Rh, Pt, and Ni; and(b) injecting into the reaction chamber an etching gas mixture comprising a first gas which is one selected from the group consisting of halogen gas, halide gas, halogen gas mixture, halide gas mixture and gas mixture of halogen and halide, and a second gas which is one selected from the group consisting of carbon oxide gas, hydrocarbon gas, and nitrogen-containing gas, to form a volatile metal halide through a reaction between the transition metal thin film and the etching gas mixture, thereby etching the transition metal thin film and converting the film into an organic metal halide, a metal amine halide, or a metal nitrosohalide, wherein the hydrocarbon gas comprises one selected from the group consisting of benzene, cyclopentadiene, toluene, and butadiene.