Invention Grant
- Patent Title: Even tungsten etch for high aspect ratio trenches
- Patent Title (中): 甚至钨蚀刻用于高纵横比沟槽
-
Application No.: US14215417Application Date: 2014-03-17
-
Publication No.: US09190293B2Publication Date: 2015-11-17
- Inventor: Xikun Wang , Jie Liu , 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: H01L21/4763
- IPC: H01L21/4763 ; H01L21/3213 ; H01J37/32

Abstract:
Methods of evenly etching tungsten liners from high aspect ratio trenches are described. The methods include ion bombardment of a patterned substrate having high aspect ratio trenches. The ion bombardment includes fluorine-containing ions and the ion bombardment may be stopped before breaking through the horizontal liner portion outside the trenches but near the opening of the trenches. The methods then include a remote plasma etch using plasma effluents formed from a fluorine-containing precursor. Plasma effluents from the remote plasma are flowed into a substrate processing region where the plasma effluents react with the tungsten. The plasmas effluents react with exposed surfaces and remove tungsten from outside the trenches and on the sidewalls of the trenches. The plasma effluents pass through an ion suppression element positioned between the remote plasma and the substrate processing region.
Public/Granted literature
- US20150170935A1 EVEN TUNGSTEN ETCH FOR HIGH ASPECT RATIO TRENCHES Public/Granted day:2015-06-18
Information query
IPC分类: