Protruding contact for integrated chip
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.
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