IC Die Surface Processing for Low-Contamination Bonding
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Solution Overview
Problem
The challenge in microelectronic packaging is the contamination of semiconductor dies during processing, which leads to poor bonding and increased manufacturing complexity and cost, particularly in stacked die arrangements using techniques like ZIBOND® and DBI®, due to the sensitivity to particles and contaminants on bonding surfaces.
Innovation Solution
A die processing method that minimizes handling and contamination by cleaning and activating dies on a dicing sheet, using techniques such as plasma ashing and wet cleaning, followed by a punch transfer method to place dies face-down on a receiving surface without direct contact with tools, reducing the number of processing steps and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handling and processing methods are used for semiconductor dies, then manufacturing flexibility is maintained, but contamination of bonding surfaces occurs leading to poor bonding and increased manufacturing complexity
Solution Approach 1:
The patent applies preliminary action by performing plasma cleaning and activation of die bonding surfaces before the dies are handled or stacked. The method cleans and activates surfaces in situ on the wafer or dicing sheet, preventing contamination before it occurs rather than attempting to clean afterward. This preliminary surface preparation ensures high bonding quality while avoiding the need for complex intermediate handling steps.
Solution Approach 2:
The patent extracts the surface cleaning and activation functions from traditional complex handling processes. By using plasma treatment to remove contaminants and activate surfaces directly on the die surfaces without requiring multiple handling, transfer, or separate cleaning operations, the method simplifies manufacturing while improving bonding reliability.
2Reliability
If multiple handling steps are performed during die processing, then processing flexibility is maintained, but contamination and defects increase
Solution Approach 1:
The patent performs surface cleaning and activation as preliminary actions before any handling or stacking operations. By preparing the bonding surfaces in advance on the wafer or dicing sheet using plasma treatment, the method eliminates the need for repeated handling and re-cleaning steps, thereby reducing defects and improving yield while simplifying the overall operation.
Solution Approach 2:
The patent uses plasma as an intermediary medium to clean and activate die surfaces without requiring direct physical contact or complex mechanical handling. The plasma treatment acts as a mediator that prepares surfaces for bonding while avoiding contamination from tools, fingers, or transfer mechanisms, thus improving yield and easing operational complexity.
3Reliability
If conventional cleaning methods are used, then processing steps are simple, but surface cleanliness and flatness are insufficient for high-reliability bonding
Solution Approach 1:
The patent changes the physical and chemical parameters of the die surfaces through plasma treatment. The plasma process modifies surface energy, removes organic and inorganic contaminants, and creates a activated surface state that enhances bonding reliability. This parameter change approach achieves superior surface cleanliness and flatness while maintaining a streamlined processing sequence.
Solution Approach 2:
The patent employs plasma, which contains highly reactive oxygen species and other oxidizing components, to rapidly and effectively clean and activate die surfaces. The strong oxidizing action of plasma removes contaminants and creates a clean, reactive surface state that conventional cleaning methods cannot achieve, thereby improving bonding reliability without significantly increasing processing complexity.
4Volume of moving object
If dies are stacked in tight arrangements for compact devices, then device size is reduced, but contamination risk and bonding sensitivity increase
Solution Approach 1:
The patent applies preliminary plasma cleaning and activation to die surfaces before stacking operations. By preparing surfaces in advance while dies are still on the wafer or dicing sheet, the method prevents contamination from occurring during subsequent tight stacking arrangements, thereby enabling compact device design without increasing contamination sensitivity.
Solution Approach 2:
The patent uses plasma as an intermediary cleaning and activation medium that can reach and treat surfaces of dies in tight arrangements without requiring physical contact or complex positioning. This intermediary approach ensures uniform surface preparation across all dies regardless of their compact spacing, reducing contamination risk while maintaining small device size.
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
This approach enhances the cleanliness and flatness of bonding surfaces, improving yield and reliability while reducing manufacturing complexity and cost, allowing for efficient stacking and bonding of dies with fewer defects.
Implementation Method 1
cleaning and activating dies on a dicing sheet, using techniques such as plasma ashing
Implementation Method 2
plasma ashing and wet cleaning
Implementation Method 3
cleaning and activating dies on a dicing sheet, using techniques such as plasma ashing and wet cleaning
Implementation Method 4
punch transfer method to place dies face-down on a receiving surface without direct contact with tools
Data Source
AI summary
Representative implementations provide techniques and systems for processing integrated circuit (IC) dies. Dies being prepared for intimate surface bonding (to other dies, to substrates, to another surface, etc.) may be processed with a minimum of handling, to prevent contamination of the surfaces or the edges of the dies. The techniques include processing dies while the dies are on a dicing sheet or other device processing film or surface. Systems include integrated cleaning components arranged to perform multiple cleaning processes simultaneously.