Invention Grant
- Patent Title: Method of forming borderless contacts
- Patent Title (中): 形成无边界接触的方法
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Application No.: US11803474Application Date: 2007-05-15
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Publication No.: US07901976B1Publication Date: 2011-03-08
- Inventor: Sriram Viswanathan , Vinay Krishna , Peter Keswick , Daniel Amzen
- Applicant: Sriram Viswanathan , Vinay Krishna , Peter Keswick , Daniel Amzen
- Applicant Address: US CA San Jose
- Assignee: Cypress Semiconductor Corporation
- Current Assignee: Cypress Semiconductor Corporation
- Current Assignee Address: US CA San Jose
- Main IPC: H01L21/00
- IPC: H01L21/00

Abstract:
A method is provided for forming a borderless contact to a local interconnect (LI) line on a substrate. Generally, the method includes steps of (i) depositing a nitride layer over a number of LI lines on the substrate, to substantially cover the LI lines; (ii) etching the nitride layer to form spacers adjacent to sidewalls of at least one of the number of LI lines and to expose at least a portion of a top surface of the LI line; (iii) depositing an inter-layer dielectric, such as an oxide, over the number of LI lines on the substrate and the spacers formed adjacent thereto; and (iv) performing a contact etch to etch contact openings through the inter-layer dielectric to expose the portion of the top surface of the underlying LI line. Other embodiments are also disclosed.
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