This article reviews the state-of-the art status of thermal atomic layer etching of various materials such as metals, metal oxides, metal nitrides, semiconductors, and their oxides. We outline basic thermodynamic principles and reaction kinetics as they apply to these reactions and draw parallels to thermal etching. Furthermore, a list of all known publications is given organized by the material etched and correlated with the required reactant for each etch process. A model is introduced that describes why in the nonsaturation mode etch anisotropies may occur that can lead to unwanted performance variations in high aspect ratio semiconductor devices due to topological constraints imposed on the delivery of reactants and removal of reactant by-products.
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Thermal atomic layer etching: A review
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Review Article|
March 12 2021
Thermal atomic layer etching: A review
Special Collection:
Atomic Layer Etching (ALE)
Andreas Fischer;
Andreas Fischer
a)
1
Lam Research Corporation
, 4400 Cushing Parkway, Fremont, California 94538
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Aaron Routzahn;
Aaron Routzahn
1
Lam Research Corporation
, 4400 Cushing Parkway, Fremont, California 94538
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Steven M. George
;
Steven M. George
2
Department of Chemistry, University of Colorado at Boulder
, Boulder, Colorado 80309
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Thorsten Lill
Thorsten Lill
1
Lam Research Corporation
, 4400 Cushing Parkway, Fremont, California 94538
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a)
Electronic mail: andreas.fischer@lamresearch.com
Note: This paper is part of the 2021 Special Topic Collection on Atomic Layer Etching (ALE).
J. Vac. Sci. Technol. A 39, 030801 (2021)
Article history
Received:
December 24 2020
Accepted:
February 25 2021
Citation
Andreas Fischer, Aaron Routzahn, Steven M. George, Thorsten Lill; Thermal atomic layer etching: A review. J. Vac. Sci. Technol. A 1 May 2021; 39 (3): 030801. https://doi.org/10.1116/6.0000894
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