Invention Grant
- Patent Title: Using a same mask for direct print and self-aligned double patterning of nanosheets
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Application No.: US16514235Application Date: 2019-07-17
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Publication No.: US11257681B2Publication Date: 2022-02-22
- Inventor: Stuart Sieg , Daniel James Dechene , Eric Miller
- 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: Ryan, Mason & Lewis, LLP
- Agent Abdy Raissinia
- Main IPC: H01L21/308
- IPC: H01L21/308 ; H01L21/8234 ; H01L21/033 ; H01L29/06 ; H01L29/40 ; H01L29/66 ; H01L27/092

Abstract:
A method of forming a semiconductor structure includes forming a nanosheet stack including alternating layers of a sacrificial material and a channel material over a substrate, the layers of channel material providing nanosheet channels for one or more nanosheet field-effect transistors. The method also includes forming a hard mask stack over the nanosheet stack, and forming a patterning layer over the hard mask stack. The method further includes patterning a lithographic mask over the patterning layer, the lithographic mask defining (i) one or more first regions for direct printing of one or more fins of a first width in the nanosheet stack and the substrate and (ii) one or more second regions for setting the spacing between two or more fins of a second width in the nanosheet stack and the substrate using self-aligned double patterning. The second width is less than the first width.
Public/Granted literature
- US20210020446A1 USING A SAME MASK FOR DIRECT PRINT AND SELF-ALIGNED DOUBLE PATTERNING OF NANOSHEETS Public/Granted day:2021-01-21
Information query
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