Non-Conformal High Selectivity Film For Etch Critical Dimension Control

A non-conformal, highly selective liner for etch methods in semiconductor devices is described. A method comprises forming a film stack on a substrate; etching the film stack to form an opening; depositing a non-conformal liner in the opening; etching the non-conformal liner from the bottom of the o...

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Bibliographische Detailangaben
Hauptverfasser:	Rao, Yingli, Wang, Huiyuan, Mallick, Abhijit Basu, Qi, Bo
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	A non-conformal, highly selective liner for etch methods in semiconductor devices is described. A method comprises forming a film stack on a substrate; etching the film stack to form an opening; depositing a non-conformal liner in the opening; etching the non-conformal liner from the bottom of the opening; and selectively etching the film stack relative to the non-conformal liner to form a logic or memory hole. The non-conformal liner comprises one or more of boron, carbon, or nitrogen.