Temporary Glass Substrate Bonding via Surface Modification
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Solution Overview
Problem
Existing methods for bonding glass substrates to carriers result in permanent bonds, making it difficult to reuse the carrier and leading to contamination and inefficiencies in manufacturing processes, especially in high-temperature polysilicon device fabrication and flat panel display production.
Innovation Solution
A method involving surface modification to create a temporary bond between a glass device substrate and a carrier substrate, using a silicon and oxygen depleted, fluorine and carbon enriched surface, allowing for moderate adhesion that is strong enough to survive processing but weak enough to permit easy debonding, enabling reusable carrier substrates and reducing manufacturing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing bonding methods are used to bond glass substrates to carriers, then strong adhesion is achieved, but the carrier cannot be reused and contamination occurs
Solution Approach 1:
The bonding strength is made dynamic through temperature-dependent behavior. The interface exhibits strong adhesion at processing temperatures (withstood up to 400-450°C) but allows easy debonding at room temperature, enabling carrier reuse. This dynamic property resolves the contradiction between needing strong bond during processing and requiring easy separation for carrier reuse.
Solution Approach 2:
The bonding characteristics are controlled by changing physical and chemical parameters of the interface. By adjusting the silicon-to-fluorine ratio and surface composition at the interface, the bond strength can be tuned to provide moderate adhesion that is sufficient for processing but allows clean debonding, enabling carrier regeneration and reuse.
2Reliability
If permanent bonds are formed between glass substrates and carriers, then processing stability is improved, but manufacturing efficiency decreases due to carrier contamination
Solution Approach 1:
The bonding interface is segmented into distinct compositional zones with a gradient structure. The interface region has depleted silicon and enriched fluorine compared to the bulk materials, creating a distinct interfacial layer that provides controlled bonding characteristics. This segmentation allows the bond to be stable during processing yet separable for carrier reuse, improving both reliability and productivity.
3Duration of action of stationary object
If strong adhesion is created between carrier and glass substrate, then bond durability during processing is improved, but debonding difficulty increases
Solution Approach 1:
The bonding behavior exhibits phase transition characteristics based on temperature. At elevated processing temperatures, the interface maintains strong adhesion through enhanced atomic mobility and bonding. Upon cooling to room temperature, the bond transitions to a weaker state that allows easy mechanical debonding. This temperature-dependent phase transition resolves the contradiction between bond durability and debonding ease.
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 allows for the reuse of carrier substrates, reduces contamination, and enhances manufacturing efficiency by providing a strong yet temporary bond that can withstand high-temperature processing without causing permanent adhesion, thus improving the reliability and cost-effectiveness of glass substrate processing.
Implementation Method 1
treating at least a portion of a first surface of a glass device substrate... the treated glass surface has: silicon of about 0.1 to about 14 at %; oxygen of about 1 to about 40 at %; carbon of about 3 to about 60 at %; fluorine of about 5 to about 65 at %
Data Source
AI summary
A method of making a device substrate article having a device modified substrate supported on a glass carrier substrate, including:treating at least a portion of the first surface of a device substrate, at least a portion of a first surface of a glass carrier, or a combination thereof, wherein the treating produces a surface having:silicon; oxygen; carbon; and fluorine amounts; and a metal to fluorine ratio as defined herein;contacting the treated surface with an untreated or like-treated counterpart device substrate or glass carrier substrate to form a laminate comprised of the device substrate bonded to the glass carrier substrate;modifying at least a portion of the non-bonded second surface of the device substrate of the laminate with at least one device surface modification treatment; andseparating the device substrate having the device modified second surface from the glass carrier substrate.