Invention Grant
- Patent Title: Protruding contact for integrated chip
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Application No.: US14583851Application Date: 2014-12-29
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Publication No.: US09601409B2Publication Date: 2017-03-21
- Inventor: Hsin-Hsien Lu , Chia-Fang Tsai
- Applicant: Taiwan Semiconductor Manufacturing Co. Ltd.
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Eschweiler & Potashnik, LLC
- Main IPC: H01L23/48
- IPC: H01L23/48 ; H01L21/768 ; H01L23/50

Abstract:
The present disclosure relates to a method of forming a back-end-of-the-line metal contact that eliminates RC opens caused by metal dishing during chemical mechanical polishing. The method is performed by depositing a sacrificial UV/thermal decomposition layer (UTDL) above an inter-level dielectric (ILD) layer. A metal contact is formed that extend through the ILD layer and the sacrificial UTDL. A chemical mechanical polishing (CMP) process is performed to generate a planar surface comprising the sacrificial UTDL. The sacrificial UTDL is then removed through an ultraviolet exposure or a thermal anneal, so that the metal contact protrudes from the ILD layer.
Public/Granted literature
- US20150115471A1 PROCESS TO ACHIEVE CONTACT PROTRUSION FOR SINGLE DAMASCENE VIA Public/Granted day:2015-04-30
Information query
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