Invention Grant
- Patent Title: Dry-etch for selective tungsten removal
- Patent Title (中): 干蚀刻用于选择性钨去除
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Application No.: US13840206Application Date: 2013-03-15
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Publication No.: US08980763B2Publication Date: 2015-03-17
- Inventor: Xikun Wang , Ching-Mei Hsu , Nitin K. Ingle , Zihui Li , Anchuan Wang
- 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 ; H01L21/3213 ; H01J37/32

Abstract:
Methods of selectively etching tungsten relative to silicon-containing films (e.g. silicon oxide, silicon carbon nitride and (poly)silicon) as well as tungsten oxide are described. The methods include a remote plasma etch formed from a fluorine-containing precursor and/or hydrogen (H2). Plasma effluents from the remote plasma are flowed into a substrate processing region where the plasma effluents react with the tungsten. The plasma effluents react with exposed surfaces and selectively remove tungsten while very slowly removing other exposed materials. Sequential and simultaneous methods are included to remove thin tungsten oxide which may, for example, result from exposure to the atmosphere.
Public/Granted literature
- US20140154889A1 DRY-ETCH FOR SELECTIVE TUNGSTEN REMOVAL Public/Granted day:2014-06-05
Information query
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