Invention Grant
- Patent Title: Double trench well formation in SRAM cells
- Patent Title (中): SRAM单元中的双沟槽形成
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Application No.: US13664214Application Date: 2012-10-30
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Publication No.: US08946050B2Publication Date: 2015-02-03
- Inventor: Werner Juengling
- Applicant: GLOBALFOUNDRIES Inc.
- Applicant Address: KY Grand Cayman
- Assignee: GLOBALFOUNDRIES Inc.
- Current Assignee: GLOBALFOUNDRIES Inc.
- Current Assignee Address: KY Grand Cayman
- Agency: Ditthavong & Steiner, P.C.
- Main IPC: H01L21/762
- IPC: H01L21/762

Abstract:
A method is provided for forming SRAM cells with low energy implants. Embodiments include forming deep trenches in a silicon substrate; forming a deep n-well or deep p-well around a bottom of each deep trench; filling the deep trenches with oxide; forming a first or second shallow trench between each pair of adjacent deep trenches; forming a first p-well or first n-well, respectively, above each deep n-well or p-well; forming a second n-well at a bottom of each first shallow trench; forming a p+ region above each second n-well on each side of each first shallow trench; filling the first shallow trenches with oxide; forming a second p-well at a bottom of each second shallow trench; filling the second shallow trenches with oxide; forming a p+ region above each second n-well on each side of each first shallow trench; and forming an n+ region above each second p-well.
Public/Granted literature
- US20140117507A1 DOUBLE TRENCH WELL FORMATION IN SRAM CELLS Public/Granted day:2014-05-01
Information query
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