Kinetics and mechanisms of Cl2 or HCl plasma etching of copper

Kinetics and mechanisms of Cl2 or HCl plasma etching of copper An investigation by experiment and computer simulation is reported into the kinetics and mechanisms of the interaction between copper and impinging reactive species as the former is etched with a chlorine or a hydrogen chloride plasma. It is established that the manner in which etching proceeds is substantially the same for the two parent gases. There are, however, considerable differences in etch rate that are related to those in the types and stationary concentrations of reactive plasma species and in their fluxes to the surface being processed. Two regimes of etching are identified over the temperature range 373–653 K that differ in the character of the etch-rate-temperature relationship and in the shape of kinetics graphs. In a higher temperature regime, the plasma-etching reaction with copper involves complete removal of etch products from the surface; it proceeds under steady-state conditions and is of first order in terms of the concentration of reactive species in the bulk plasma. This occurs at temperatures above 500–520 K for Cl2 plasmas and at above 580–600 K for HCl plasmas. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Microelectronics Springer Journals

Kinetics and mechanisms of Cl2 or HCl plasma etching of copper

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Publisher
Springer Journals
Copyright
Copyright © 2007 by Pleiades Publishing, Ltd.
Subject
Engineering; Electronic and Computer Engineering
ISSN
1063-7397
eISSN
1608-3415
D.O.I.
10.1134/S1063739707060029
Publisher site
See Article on Publisher Site

Abstract

An investigation by experiment and computer simulation is reported into the kinetics and mechanisms of the interaction between copper and impinging reactive species as the former is etched with a chlorine or a hydrogen chloride plasma. It is established that the manner in which etching proceeds is substantially the same for the two parent gases. There are, however, considerable differences in etch rate that are related to those in the types and stationary concentrations of reactive plasma species and in their fluxes to the surface being processed. Two regimes of etching are identified over the temperature range 373–653 K that differ in the character of the etch-rate-temperature relationship and in the shape of kinetics graphs. In a higher temperature regime, the plasma-etching reaction with copper involves complete removal of etch products from the surface; it proceeds under steady-state conditions and is of first order in terms of the concentration of reactive species in the bulk plasma. This occurs at temperatures above 500–520 K for Cl2 plasmas and at above 580–600 K for HCl plasmas.

Journal

Russian MicroelectronicsSpringer Journals

Published: Nov 16, 2007

References

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