Hybrid Material Post-CMP Brushes for Semiconductor Wafer Cleaning
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Solution Overview
Problem
Conventional brushes used in semiconductor manufacturing for post-CMP cleaning release contaminants during conditioning, leading to prolonged conditioning times and increased productivity and cost burdens.
Innovation Solution
Development of hybrid brushes with a mandrel and two layers, where the first layer is less compressible and the second layer is denser, using different materials such as PVAc and polyurethane, with distinct pore sizes and distributions, and a fastening mechanism to reduce particle release and conditioning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional brushes are used for post-CMP cleaning, then the brush structure is simple and easy to manufacture, but the brush releases contaminants during conditioning requiring prolonged conditioning time
Solution Approach 1:
The brush is divided into multiple layers with different materials and properties. The brush comprises a mandrel, a first layer molded about the mandrel, and a second layer molded about the first layer, where each layer has distinct characteristics for different functions
Solution Approach 2:
The brush uses composite materials with different properties in different layers. The first layer and second layer are made of different materials with different compressibility, pore sizes, and contaminant release characteristics to optimize both cleaning effectiveness and reduced conditioning time
2Productivity
If conventional single-material brushes are used, then the manufacturing process is simple, but the brush requires prolonged conditioning to remove particulates
Solution Approach 1:
The brush is segmented into multiple layers that can be manufactured separately and then assembled, allowing each layer to be optimized for specific functions while reducing overall conditioning requirements
Solution Approach 2:
The brush is pre-conditioned during manufacturing by molding the layers together, which removes particulates from the brush structure before the brush is put into service, eliminating the need for prolonged on-site conditioning
3Loss of time
If hybrid multi-layer brushes are implemented, then contaminant release is reduced and conditioning time is shortened, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The brush is divided into discrete layers that can be manufactured using standard molding techniques and then assembled, making the complexity manageable through modular construction
Solution Approach 2:
The use of composite materials in different layers provides functional benefits that justify the increased complexity, as each material is selected for specific properties that optimize brush performance and reduce conditioning requirements
Data Source
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AI summary
Provided is disclosure for hybrid material post-CMP brushes and methods for forming the same. Embodiments of a hybrid material post-CMP brush may comprise at least two layers, where the hybrid brush is used to clean various surfaces, such as surfaces of semiconductor substrates. An example hybrid brush for cleaning a surface includes a mandrel, a molded first layer formed about the mandrel, where the molded first layer comprises a first material, and a molded second layer surrounding the molded first layer, where the molded second layer comprises a second material.