Porous Bonding Layer for Semiconductor Substrate Handling
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Solution Overview
Problem
Existing methods for manufacturing semiconductor structures face challenges in handling thin layers due to risk of damage during transfer, particularly when subjected to high-temperature processes, and require costly and complex processes for separation and recycling of substrates.
Innovation Solution
A method involving direct bonding of a substrate to a handle substrate using a porous bonding layer made of an inorganic matrix with organic compounds, which allows for high-temperature processing without detachment and enables spontaneous disassembly through thermal treatment, eliminating the need for prior weakening operations and reducing material loss and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adhesive layer bonding is used to temporarily bond substrates, then the bonding can be easily separated by mechanical means or thermal transformation, but the adhesive materials become degraded and unstable under mechanical or thermal stresses in excess of 400°C
Solution Approach 1:
The patent uses oxide-oxide direct bonding instead of adhesive bonding, fundamentally changing the bonding mechanism to enable high-temperature stability. The oxide layers on both substrates form strong chemical bonds that remain stable at temperatures exceeding 400°C, eliminating the degradation issues of polymer adhesives while maintaining separability through controlled mechanical or chemical means.
Solution Approach 2:
The patent introduces a sacrificial weakened layer that is deliberately designed to fail first during separation. This layer acts as a disposable element that protects the valuable substrates from damage during the separation process, allowing the expensive substrates to be reused while the sacrificial layer is discarded.
2Reliability
If oxide-oxide direct bonding is used to temporarily bond substrates, then the bonding is strong enough to withstand high-temperature processing, but the separation requires sacrifice of the handle substrate which generates substantial costs
Solution Approach 1:
The patent segments the bonding interface by introducing a distinct sacrificial weakened layer between the two substrates. This layer is specifically designed with lower bond strength so that when separation is needed, the failure occurs at this predefined weak interface rather than damaging the valuable substrates. The segmentation creates a controlled failure path that preserves the expensive substrate materials for reuse.
Solution Approach 2:
The sacrificial weakened layer acts as an intermediary element between the two substrates. It mediates the bonding and separation process by providing a controlled weak interface that fails first during separation. This intermediary layer protects the valuable substrates from direct damage while still enabling strong temporary bonding during processing.
3Ease of operation
If a porous layer is used to weaken the substrate for separation, then the temporary structure can be disassembled, but the surfaces of the separated substrates are non-uniform and require CMP step which consumes part of the substrate
Solution Approach 1:
The patent uses a sacrificial weakened layer made of the same material as the substrate but with intentionally reduced strength. This disposable layer enables easy separation while protecting the valuable substrates from surface damage. Unlike porous layers that create non-uniform surfaces requiring costly CMP processing, the sacrificial layer separates cleanly without compromising substrate surface uniformity, eliminating the need for additional polishing steps.
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
Enables the handling of thin layers at high temperatures (up to 600°C) without damage, simplifies the separation process, and allows for cost-effective recycling of substrates by spontaneous disassembly within the bonding layer, reducing material loss and surface roughness.
Implementation Method 1
the bonding layer being made of a porous material made up of an inorganic matrix and organic compounds connected or not to said matrix... providing a thermal budget for disassembly resulting in a spontaneous disassembly of the temporary structure occurring at the bonding layer
Implementation Method 2
providing a thermal budget for disassembly to the intermediate structure... enables spontaneous disassembly through thermal treatment
Data Source
AI summary
A method for manufacturing a semiconductor structure, including: direct bonding a substrate to be handled with a handle substrate via a bonding layer covering the handle substrate, to form a temporary structure capable of withstanding technological steps; disassembling the temporary structure at the bonding layer to separate the substrate to be handled from the handle substrate; and a prior depositing the bonding layer onto the handle substrate and/or onto the substrate to be handled, the bonding layer including a porous material including, an inorganic matrix and organic compounds connected or not to the matrix, and the disassembling is carried out by providing a thermal budget for disassembly to the intermediate structure, the providing resulting in a spontaneous disassembly of the temporary structure occurring at the bonding layer.