Invention Grant
- Patent Title: Multi-level contact to a 3D memory array and method of making
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Application No.: US14631047Application Date: 2015-02-25
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Publication No.: US09305935B2Publication Date: 2016-04-05
- Inventor: Yao-Sheng Lee , Zhen Chen , Syo Fukata
- Applicant: SANDISK TECHNOLOGIES INC.
- Applicant Address: US TX Plano
- Assignee: SANDISK TECHNOLOGIES INC.
- Current Assignee: SANDISK TECHNOLOGIES INC.
- Current Assignee Address: US TX Plano
- Agency: The Marbury Law Group PLLC
- Main IPC: H01L27/115
- IPC: H01L27/115 ; H01L29/66 ; H01L27/108 ; H01L21/768 ; H01L29/792 ; H01L23/48 ; H01L27/11

Abstract:
A method of making multi-level contacts. The method includes providing an in-process multilevel device including at least one device region and at least one contact region. The contact region includes a plurality of electrically conductive layers configured in a step pattern. The method also includes forming a conformal etch stop layer over the plurality of electrically conductive layers, forming a first electrically insulating layer over the etch stop layer, forming a conformal sacrificial layer over the first electrically insulating layer and forming a second electrically insulating layer over the sacrificial layer. The method also includes etching a plurality of contact openings through the etch stop layer, the first electrically insulating layer, the sacrificial layer and the second electrically insulating layer in the contact region to the plurality of electrically conductive layers.
Public/Granted literature
- US20150179663A1 MULTI-LEVEL CONTACT TO A 3D MEMORY ARRAY AND METHOD OF MAKING Public/Granted day:2015-06-25
Information query
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