Dynamic Load Cup Wafer Alignment Mechanism
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Solution Overview
Problem
The chemical mechanical polishing (CMP) process in semiconductor manufacturing faces inefficiencies in aligning semiconductor wafers with polishing heads, leading to misalignment and potential damage during the polishing process, which affects production efficiency.
Innovation Solution
A load cup with a pedestal and arrangement parts that can be moved horizontally and rotated to align the center of the wafer with the polishing head, ensuring precise alignment and secure loading of the wafer onto the polishing head, utilizing a system of fastening and sliding guide portions to adjust for misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional load cup structure is used, then the device complexity is low, but the manufacturing precision of wafer alignment deteriorates
Solution Approach 1:
The load cup structure is made dynamic by introducing movable arrangement parts that can be positioned horizontally toward the center of the pedestal. These parts include sliding guide portions that enable adjustable positioning, transforming the static load cup into a dynamic alignment system that adapts to wafer position variations.
Solution Approach 2:
The load cup is segmented into multiple functional components: a pedestal for supporting the wafer, multiple arrangement parts with base portions and arrangement part bodies, sliding guide portions, and fastening portions. This segmentation allows each component to perform its specific function independently, improving overall alignment precision while maintaining manageable complexity.
2Productivity
If manual alignment method is used, then the device complexity is low, but the productivity deteriorates
Solution Approach 1:
The alignment system performs self-alignment through the interaction of sliding guide portions and arrangement part bodies. When the arrangement parts are moved horizontally, the sliding guides automatically guide the arrangement part bodies to contact the polishing head and wafer, enabling automatic center alignment without requiring manual intervention or complex external alignment devices.
Solution Approach 2:
The arrangement parts are pre-positioned around the pedestal in a retracted state. Before the wafer and polishing head are loaded, the system is prepared with the arrangement parts in their initial positions. During the loading process, the arrangement parts are then moved horizontally to perform the alignment function, ensuring that alignment is accomplished before the actual polishing operation begins.
3Adaptability or versatility
If fixed arrangement parts are used, then the device complexity is low, but the adaptability deteriorates
Solution Approach 1:
The arrangement parts are designed with movable bases that can be positioned horizontally toward the center of the pedestal. This dynamic capability allows the arrangement parts to adapt to different wafer positions and polishing head locations, providing versatility in alignment adjustment while maintaining a relatively simple structural design through the use of sliding guides.
Data Source
AI summary
Provided is a load cup including a cup having an internal space, a pedestal provided in the internal space, able to be lifted up and down, and loading a wafer onto or unloading a wafer from a polishing head, and a plurality of arrangement parts having a plurality of fastening portions disposed around the pedestal, and moved horizontally in a direction of a center of the pedestal, and arrangement part bodies coupled to the plurality of fastening portions, respectively, and rotated or reciprocated so as to contact a lateral surface of the polishing head, adjusting a center of the wafer to be aligned with a center of the polishing head. A polishing process may then be performed on a layer formed on the wafer.