Semiconductor Layer Transfer With Low-Temperature Defect Healing
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Solution Overview
Problem
Current methods for creating 3D integrated circuits with superimposed transistors are costly due to the use of SOI substrates and involve thermal processes that degrade lower-level components, and fail to effectively correct surface roughness and defects in the transferred semiconductor layer.
Innovation Solution
A method involving a bulk silicon substrate with ion species implantation, amorphization, and solid-phase recrystallization to transfer a monocrystalline semiconductor layer, using a smoothing layer and selective etching to control thickness and heal defects without degrading the lower-level components, and employing plasma-assisted oxidation and chemical etching to remove surface impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal oxidation at 900-1200°C is used to correct surface roughness and control thickness, then surface quality and thickness uniformity are improved, but lower-level components are degraded
Solution Approach 1:
The patent changes the temperature parameter from conventional 900-1200°C thermal oxidation to low-temperature plasma treatment (below 400°C), achieving surface roughness correction without thermal degradation. This parameter change allows the same functional outcome (surface smoothing) without the harmful thermal effects on lower-level components.
Solution Approach 2:
The patent replaces the thermal field (thermal oxidation) with a plasma field (plasma-assisted oxidation). This substitution enables surface treatment through chemical reactions in plasma environment rather than thermal processes, achieving surface quality improvement without the high temperatures that cause component degradation.
2Reliability
If heat treatment at temperatures greater than 900°C is used to heal defects, then defect healing is improved, but lower-level components are degraded
Solution Approach 1:
The patent changes the temperature parameter from high-temperature heat treatment (>900°C) to low-temperature plasma treatment (below 400°C). The plasma environment enables defect healing through ion bombardment and chemical reactions rather than thermal diffusion, achieving reliability improvement without thermal damage to lower-level components.
Solution Approach 2:
The patent replaces thermal field-based defect healing with plasma field-based healing. The plasma provides ions, electrons, and reactive species that directly interact with defects in the semiconductor layer, enabling defect annihilation and crystalline structure recovery without the need for high temperatures that would degrade underlying components.
3Manufacturing precision
If Smart Cut method with SOI substrate is used for layer transfer, then transfer quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive SOI substrates with cheaper bulk silicon substrates. The bulk silicon serves as a disposable donor substrate for the transfer process, eliminating the need for costly pre-fabricated SOI wafers while still enabling high-quality layer transfer through the combination of ion implantation and plasma treatment.
Solution Approach 2:
The patent changes the substrate material parameter from SOI (silicon-on-insulator) to bulk silicon. This material parameter change, combined with low-temperature plasma treatment, achieves comparable or superior transfer quality at lower cost by eliminating the expensive SOI substrate requirement while maintaining transfer precision through controlled plasma processes.
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 creation of 3D devices with improved surface roughness and defect healing without thermal degradation of lower-level components, reducing manufacturing costs and enhancing the integrity of the transferred semiconductor layer.
Implementation Method 1
the implantation of ion species into the SOI substrate so as to form a fragilization plane
Implementation Method 2
recrystallization in solid phase of the amorphous layer to form a transferred monocrystalline semiconductor layer
Implementation Method 3
plasma-assisted oxidation and chemical etching to remove surface impurities
Data Source
AI summary
A method for creating a substrate of the semiconductor on insulator type includes steps of a) providing a donor substrate having a monocrystalline support substrate, a smoothing layer and a semiconductor layer, the smoothing layer forming an etch stop layer with respect to the material of the support substrate; a′) implantation of ion species through the semiconductor layer to form a fragilisation plane; b) creating an assembly by placing the donor substrate and a receiver substrate in contact; and c) transferring the semiconductor layer and at least a part of the smoothing layer by detachment along the fragilization plane. The semiconductor layer provided in a) is monocrystalline. The method may further include, before b), amorphization of at least a part of the semiconductor layer to form an amorphous layer; and during or after c), recrystallization in solid phase of the amorphous layer to form a transferred monocrystalline semiconductor layer.