Invention Grant
- Patent Title: Titanium oxide etch
- Patent Title (中): 氧化钛蚀刻
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Application No.: US14157724Application Date: 2014-01-17
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Publication No.: US09287134B2Publication Date: 2016-03-15
- Inventor: Xikun Wang , Lin Xu , Anchuan Wang , Nitin K. Ingle
- Applicant: APPLIED MATERIALS, INC.
- Applicant Address: US CA Santa Clara
- Assignee: Applied Materials, Inc.
- Current Assignee: Applied Materials, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: Kilpatrick Townsend & Stockton LLP
- Main IPC: H01L21/302
- IPC: H01L21/302 ; H01L21/311 ; H01L21/033 ; H01J37/32

Abstract:
Methods of selectively etching titanium oxide relative to silicon oxide, silicon nitride and/or other dielectrics are described. The methods include a remote plasma etch using plasma effluents formed from a fluorine-containing precursor and/or a chlorine-containing precursor. Plasma effluents from the remote plasma are flowed into a substrate processing region where the plasma effluents react with the titanium oxide. The plasmas effluents react with exposed surfaces and selectively remove titanium oxide while very slowly removing other exposed materials. A direction sputtering pretreatment is performed prior to the remote plasma etch and enables an increased selectivity as well as a directional selectivity. In some embodiments, the titanium oxide etch selectivity results partly from the presence of an ion suppression element positioned between the remote plasma and the substrate processing region.
Public/Granted literature
- US20150206764A1 TITANIUM OXIDE ETCH Public/Granted day:2015-07-23
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