Invention Grant
- Patent Title: Selective CVD alignment-mark topography assist for non-volatile memory
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Application No.: US15983689Application Date: 2018-05-18
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Publication No.: US10515903B2Publication Date: 2019-12-24
- Inventor: Michael Rizzolo , Chih-Chao Yang , Lawrence A. Clevenger , Benjamin D. Briggs
- 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: Tutunijian & Bitetto, P.C.
- Agent Vazken Alexanian
- Main IPC: H01L23/544
- IPC: H01L23/544 ; H01L27/22

Abstract:
A semiconductor device and method for forming the semiconductor device are described. The method includes recessing a device pad to below a top surface of an interconnect layer and depositing a cap in the recess over the device pad. A topography assist layer is formed over each of at least one alignment mark using a selective deposition process that deposits material on conductive material of the at least one alignment mark selective to the metal nitride of the device pad such that a top surface of the topography assist feature is higher than a top surface of the cap. Device layers are deposited conformally over the interconnect layer such that the topography assist layer causes a topographical feature in a top surface of the deposited device layers, the topographical feature being vertically aligned with the topography assist layer. The device pad is aligned according to the topographical feature.
Public/Granted literature
- US20190355668A1 SELECTIVE CVD ALIGNMENT-MARK TOPOGRAPHY ASSIST FOR NON-VOLATILE MEMORY Public/Granted day:2019-11-21
Information query
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