CMP Suction Pad Assembly for Uniform Wafer Planarization
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Solution Overview
Problem
The challenge in integrated circuit fabrication is the non-planar upper surface of integrated circuits resulting from repeated material deposition, which affects the structural integrity and the ability to form additional semiconductor devices, leading to potential device failure.
Innovation Solution
A suction pad assembly with a suction platen and sensors is used for chemical mechanical planarization (CMP), where the suction platen has dense suction openings and lateral guards to secure the pad during rotation, and sensors monitor suction force and surface uniformity to detect and remediate abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If repeated deposition of materials is performed to increase device density, then the integration scale and device density are improved, but the upper surface becomes non-planar which deteriorates structural integrity and manufacturing precision
Solution Approach 1:
The patent extracts and removes the protrusions and non-planar features from the wafer surface through CMP processing. The polishing pad selectively removes material from elevated regions to restore planarity, enabling continued device fabrication without structural integrity issues
Solution Approach 2:
The patent changes the physical and chemical parameters of the wafer surface through CMP processing. By controlling abrasive particle size, slurry composition, and polishing pressure, the surface topology is transformed from non-planar to planar while maintaining device functionality
2Manufacturing precision
If CMP processing is applied to planarize the surface, then surface uniformity is improved, but the complexity of the fabrication process increases
Solution Approach 1:
The patent combines chemical etching and mechanical polishing into a single integrated CMP process. This merging of two separate operations into one unified process achieves superior surface uniformity while reducing the total number of process steps compared to sequential chemical and mechanical treatments
Solution Approach 2:
The polishing pad serves multiple functions simultaneously: it provides mechanical polishing action, delivers chemical slurry to the surface, removes debris, and maintains consistent contact pressure. This multi-functionality reduces the need for separate processing equipment and steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The suction pad assembly effectively planarizes the integrated circuit surface, preventing slippage and non-uniformities, ensuring consistent polishing and enhancing the structural integrity and yield of semiconductor devices.
Implementation Method 1
a pump in fluid communication with each of the suction openings to produce suction at the suction openings that adheres the pad to the platen
Implementation Method 2
a sensor configured to collect sensor data characterizing a uniformity of adherence between the pad and the platen
Implementation Method 3
the pump is configured to produce the suction at the suction openings based on the sensor data
Data Source
AI summary
In an embodiment, a system includes: a pad comprising a first side and a second side opposite the first side, wherein the first side is configured to receive a wafer during chemical mechanical planarization (CMP), and a platen adjacent the pad along the second side, wherein the platen comprises a suction opening that interfaces with the second side; a pump configured to produce suction at the suction opening to adhere the second side to the platen; and a sensor configured to collect sensor data characterizing a uniformity of adherence between the pad and the platen, wherein the pump is configured to produce the suction at the suction opening based on the sensor data.