Semiconductor Chip Stack Self-Alignment via Surface Treatment
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Solution Overview
Problem
Current semiconductor chip stack packaging methods require precise alignment equipment and processes, leading to increased costs and reduced productivity due to complex processes and potential defects, especially in achieving high-density and ultrahigh-speed signal processing.
Innovation Solution
A semiconductor chip stack package manufacturing method utilizing hydrophilic and hydrophobic surface treatments to enable self-alignment of chips, where hydrophilic surfaces are treated with materials like oxides or polymers and hydrophobic surfaces with CF4 or PTFE, allowing chips to be aligned and bonded using heat or pressure without precise devices, and subsequently fixed with adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precise alignment equipment and complex processes are used to align chips, then alignment accuracy is improved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The chip structure itself provides alignment functionality through its design features (alignment marks, guide structures, or self-aligning geometries), eliminating the need for external precise alignment equipment. The chip automatically positions itself relative to other components during assembly, achieving high alignment accuracy through self-service mechanisms.
Solution Approach 2:
Alignment features and structures are prepared in advance during chip fabrication, such as pre-formed alignment marks, guide protrusions, or predetermined positioning structures. This preliminary preparation enables rapid and accurate alignment during assembly without requiring complex real-time adjustment equipment, thereby improving both accuracy and productivity.
2Manufacturing precision
If precise alignment equipment and complex processes are used to align chips, then alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The alignment function is built into the chip structure itself, eliminating the need for complex external alignment equipment and procedures. The chip's own geometric features or integrated alignment structures perform the alignment function, significantly simplifying the overall device and process complexity while maintaining high precision.
Solution Approach 2:
The invention changes the approach from active alignment (using equipment to adjust positions) to passive alignment (relying on predetermined geometric parameters and tolerances). By carefully designing alignment features with specific dimensional parameters and tolerances, accurate alignment is achieved through parameter control rather than complex active adjustment mechanisms.
3Manufacturing precision
If complex alignment processes are used, then alignment accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The chip structure provides its own alignment capability, eliminating the need for expensive external alignment equipment and complex alignment procedures. This self-service approach significantly reduces manufacturing costs while maintaining high alignment accuracy, as the alignment function is integrated into the chip itself rather than requiring separate costly systems.
Solution Approach 2:
Alignment features are incorporated into the chip during standard fabrication processes, spreading the cost across the entire manufacturing workflow rather than requiring separate expensive alignment steps. This preliminary integration of alignment functionality into the fabrication process reduces overall manufacturing costs compared to adding complex post-fabrication alignment equipment and procedures.
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 method simplifies the manufacturing process, improves alignment accuracy, and enhances productivity while maintaining uniform quality, allowing for rapid and stable chip alignment without the need for expensive alignment equipment.
Implementation Method 1
performing hydrophilic surface treatment of an attachment surface of the chip to have a hydrophilic surface
Implementation Method 2
performing hydrophobic surface treatment of a region of the attachment surface of the chip subjected to the hydrophilic surface treating that does not contact another chip to have a hydrophobic surface
Data Source
AI summary
The present invention relates to a semiconductor chip stack package and a manufacturing method thereof, and more particularly, to a semiconductor chip stack package and a manufacturing method thereof in which a plurality of chips can be rapidly arranged and bonded without a precise device or operation so as to improve productivity.