Polysiloxane Adhesive Debonding for Semiconductor Wafer Processing
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Solution Overview
Problem
Current temporary wafer bonding methods in the semiconductor industry face challenges such as low yield, low productivity, and complexity due to the need for high-temperature processing, harsh solvent cleaning, and the use of UV or laser sources, which are costly and difficult to manage, especially when handling thin, fragile patterned wafers for 3-D packaging and LED applications.
Innovation Solution
A method involving the application of a silsesquioxane-based release layer and a polysiloxane-based adhesive, which are immiscible and can be thermally or UV-activated for bonding, allowing for debonding by solvent dissolution, thereby simplifying the process and reducing manufacturing costs and downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature processing (285°C) and harsh solvent cleaning are used for debonding, then the bonding strength is maintained, but yield and productivity decrease
Solution Approach 1:
The patent changes the chemical parameters of the adhesive layer by using a polysiloxane-based adhesive that can be selectively dissolved by organic solvents. This allows debonding to occur through solvent dissolution rather than high-temperature processing, dramatically improving throughput while maintaining bonding strength during processing
Solution Approach 2:
The patent replaces the thermal-mechanical debonding system (high-temperature sliding) with a chemical dissolution system. The adhesive layer is designed to be soluble in organic solvents, allowing gentle chemical debonding instead of harsh mechanical sliding, which improves both yield and productivity
2Ease of operation
If UV or laser sources are used for debonding, then the bonding can be released, but cost and operational complexity increase
Solution Approach 1:
The patent replaces complex UV or laser debonding systems with a simple organic solvent dissolution system. The adhesive layer is specifically designed to be soluble in common organic solvents, allowing debonding through simple chemical浸泡 instead of expensive and complex UV or laser equipment
Solution Approach 2:
The patent uses a disposable adhesive layer made of polysiloxane-based material that is inexpensive and designed to be dissolved by organic solvents. This replaces expensive and complex UV or laser debonding systems with a simple, low-cost chemical dissolution approach
3Strength
If plasma treatment is applied to improve surface compatibility, then adhesion is enhanced, but process complexity and cost increase
Solution Approach 1:
The patent changes the chemical parameters of the adhesive composition itself by using a polysiloxane-based adhesive with inherent compatibility for silicon wafer surfaces. This eliminates the need for plasma treatment while maintaining strong adhesion, simplifying the process and reducing costs
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 wafer handling and processing efficiency, improves throughput, and reduces manufacturing costs by enabling easy debonding and cleaning with organic solvents, while maintaining the integrity of the wafers during grinding and TSV processing.
Implementation Method 1
a silsesquioxane-based release layer and a polysiloxane-based adhesive, which are immiscible and can be thermally or UV-activated for bonding
Implementation Method 2
allowing for debonding by solvent dissolution
Implementation Method 3
a silsesquioxane-based release layer and a polysiloxane-based adhesive, which are immiscible and can be thermally or UV-activated for bonding
Data Source
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AI summary
A method of treating the surface of a semiconductor wafer through the formation of a bonding system is provided in order to enhance the handling of the wafer during subsequent processing operations. The method generally comprises the steps of applying a release layer (10) and an adhesive (15) to different wafers (5, 20); bonding the wafers together to form a bonded wafer system; performing at least one wafer processing operation (e.g., wafer grinding, etc.) to form a thin processed wafer; debonding the wafers; and then cleaning the surface of the processed wafer with an organic solvent that is capable of dissolving the release layer or any residue thereof. The adhesive includes a vinyl - functionalized polysiloxane oligomeric resin, a Si-H functional polysiloxane oligomeric resin, a catalyst, and optionally an inhibitor, while the release layer is comprised of either a silsesquioxane -based resin or a thermoplastic resin.