Semiconductor Package SAM Coating for FOPLP Stiction Reduction
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Solution Overview
Problem
Fan out panel-level-packaging (FOPLP) in semiconductor manufacturing faces contamination issues due to the polar/hydrophilic nature of molding compound, chip, and metallic surfaces, leading to high surface stiction and reduced production yield.
Innovation Solution
Applying a self-assembled monolayer (SAM) coating to transform hydrophilic surfaces into hydrophobic surfaces, increasing the water contact angle beyond 90 degrees and reducing surface stiction, thereby enhancing the hydrophobicity of the semiconductor package surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the semiconductor package uses polar/hydrophilic surfaces (molding compound, chip, metallic surfaces), then the surfaces can be easily manufactured with standard materials, but the surfaces attract contaminants and exhibit high surface stiction, reducing production yield
Solution Approach 1:
The patent applies self-assembled monolayer (SAM) coatings to transform the surface properties of semiconductor packages from hydrophilic to hydrophobic. This chemical modification changes the surface energy and wettability parameters, increasing water contact angle from typically less than 90 degrees to greater than 90 degrees. The SAM layers (such as fluorinated or alkylated silanes) alter surface chemistry without changing bulk material properties, thereby reducing surface stiction and contaminant attraction while maintaining manufacturing compatibility
Solution Approach 2:
The self-assembled monolayer acts as an intermediary substance between the semiconductor package surfaces and the external environment (contaminants, moisture, other components). This intermediate layer provides a hydrophobic barrier that prevents direct interaction between hydrophilic base materials and contaminating substances, reducing adhesion forces and surface stiction without requiring changes to the underlying semiconductor materials or manufacturing processes
2Object-affected harmful factors
If more efficient pumping mechanisms are used to improve clean room environment, then the contamination control is enhanced, but the cost increases significantly
Solution Approach 1:
The patent applies hydrophobic surface treatments (SAM coatings) to semiconductor packages during the manufacturing process, before packaging and deployment. This preliminary action permanently modifies surface properties to resist contamination, eliminating the need for more complex clean room pumping systems during operation. The surface modification is performed once during fabrication, providing ongoing contamination resistance without requiring complex environmental control infrastructure
3Productivity
If the semiconductor package surfaces are made hydrophobic through SAM coating, then surface stiction and contamination are reduced, but an additional manufacturing step is required
Solution Approach 1:
The self-assembled monolayer coating process is designed to be self-organizing and self-limiting. When SAM precursor molecules are introduced to the substrate, they automatically assemble into ordered monolayers through spontaneous chemical adsorption and reorganization, forming uniform hydrophobic surfaces without requiring complex deposition equipment or multiple processing steps. The process self-regulates to form complete coverage, reducing the need for sophisticated process control infrastructure
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 SAM coating effectively reduces contamination and improves the production yield by transforming polar/hydrophilic surfaces into hydrophobic ones, increasing water repellency and lowering surface stiction, thus addressing the contamination challenges in FOPLP.
Implementation Method 1
coating a first self-assembled monolayer (SAM) over the first surface and the second surface of the package body
Implementation Method 2
transforming the first surface from a hydrophilic state to a hydrophobic state by immersing the semiconductor chip into a self-assembled monolayer solution
Data Source
AI summary
A method for manufacturing a semiconductor package structure includes providing a semiconductor chip, encapsulating the semiconductor chip via a package body, the package body having a first surface opposite to a second surface, and coating a first self-assembled monolayer (SAM) over the first surface and the second surface of the package body.