Invention Grant
- Patent Title: Method and structure for forming transistors with high aspect ratio gate without patterning collapse
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Application No.: US16515373Application Date: 2019-07-18
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Publication No.: US10832956B2Publication Date: 2020-11-10
- Inventor: Kangguo Cheng
- Applicant: International Business Machines Corporation
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Fleit Intellectual Property Law
- Agent Donna Flores
- Main IPC: H01L27/12
- IPC: H01L27/12 ; H01L21/8234 ; H01L29/66 ; H01L29/78 ; H01L27/088 ; H01L29/786 ; H01L29/423

Abstract:
A method for fabricating transistors comprises forming a fin above a semiconductor substrate; forming an isolation region with a dielectric material, the top surface of the isolation dielectric below the top of fin surface; depositing a dummy gate layer above the isolation region and surrounding the fin, a dummy gate hardmask layer on top of the dummy gate layer, a first hardmask material on top of the dummy gate hardmask layer above the fin and a second hardmask material on top of the dummy gate hardmask layer above the isolation region, the first hardmask material having a greater lateral etch than the second hardmask material; applying a gate patterning mask spaced equidistantly apart on top of the first and second hardmask materials; and etching the transistor to simultaneously form narrow active gates above and surrounding the fin and wide dummy gates above the isolation region.
Public/Granted literature
- US20200027792A1 METHOD AND STRUCTURE FOR FORMING TRANSISTORS WITH HIGH ASPECT RATIO GATE WITHOUT PATTERNING COLLAPSE Public/Granted day:2020-01-23
Information query
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