Suction Pad Assembly Uniformity Control for CMP 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 suction openings and a pump system that provides a sufficient suction force to adhere a pad to a suction platen, allowing for chemical mechanical planarization (CMP) while sensors monitor and adjust the suction force to maintain uniformity and prevent slippage, ensuring effective polishing and planarization.
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 applies preliminary planarization actions between deposition steps. The CMP (chemical mechanical polishing) process is performed as a preliminary action to restore surface planarity before subsequent deposition steps, preventing the accumulation of topography variations that would otherwise compromise structural integrity and device fabrication.
Solution Approach 2:
The patent implements continuous planarization through repeated CMP steps interspersed among deposition steps. This continuous intervention maintains surface planarity throughout the multi-step fabrication process, enabling sustained high device density without compromising surface quality or structural integrity.
2Manufacturing precision
If planarization techniques are applied to maintain surface planarity, then manufacturing precision is improved, but the fabrication process complexity and time increase
Solution Approach 1:
The patent segments the fabrication process into discrete deposition and planarization stages. By dividing the overall fabrication into manageable segments with planarization performed at specific intervals, the process maintains precision without requiring complete redesign of the entire fabrication sequence, thus limiting the increase in overall complexity.
3Manufacturing precision
If planarization techniques are applied to maintain surface planarity, then manufacturing precision is improved, but the fabrication time increases
Solution Approach 1:
The patent applies partial planarization actions rather than continuous planarization. CMP steps are performed for limited durations and at specific intervals rather than continuously, providing sufficient planarity correction to maintain precision while minimizing the total time consumed by planarization operations.
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, enhancing structural integrity and preventing device failure by maintaining consistent suction force and surface uniformity during CMP, thus improving the fabrication process.
Implementation Method 1
a pump configured to produce suction at the suction opening to adhere the pad to the platen
Implementation Method 2
a sensor configured to collect sensor data characterizing an abnormality at the pad or the platen during performance of the chemical mechanical planarization process
Data Source
AI summary
A method and 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.