Active Layer Transfer Using Complementary Topology Substrate

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Solution Overview

Problem

The transfer of active layers with non-uniform three-dimensional surface topologies to final substrates is challenging due to the fragility and thickness of these layers, as existing methods require planarization, which can damage electrical components and increase production complexity and cost.

Innovation Solution

A process involving a temporary substrate with a surface topology complementary to the active layer's surface topology, allowing direct bonding without additional treatments or materials, thereby encapsulating the active layer's topology and preventing component damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If planarization treatment is applied to the active layer surface, then bonding surface uniformity is improved, but electrical components are damaged and production complexity increases

Engineering Contradiction:

Improvebonding surface uniformityVSAvoidproduction complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of modifying the active layer surface to achieve planarity, the invention inverts the approach by modifying the temporary substrate surface to match the active layer's topography. The temporary substrate is provided with a surface topology that is complementary to the active layer's three-dimensional surface topology, allowing direct bonding without planarization treatment of the active layer.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The temporary substrate acts as an intermediary that adapts to the active layer's surface topology. By providing a complementary surface topology on the temporary substrate, the invention creates a matching interface that enables secure bonding without requiring modification of the active layer's electrical components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If adhesive material layer is added to planarize the active layer surface, then bonding capability is improved, but production cost increases and electrical components are damaged

Engineering Contradiction:

Improvebonding capabilityVSAvoidproduction cost

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The invention eliminates the need for adhesive material layers by inverting the problem-solving approach. Instead of adding material to the active layer to achieve planarity, the temporary substrate is pre-formed with a complementary surface topology that naturally matches the active layer's three-dimensional structure, enabling direct bonding without additional layers.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention extracts and removes the adhesive material layer from the process entirely. By providing the complementary topology directly on the temporary substrate, the need for intermediate adhesive layers is eliminated, reducing production steps and costs while avoiding damage to electrical components.

Inventive Principle:

Principle #2Taking out (Extraction)

3Manufacturing precision

If multiple layers are deposited to achieve planarity, then bonding surface quality is improved, but process complexity and production cost increase

Engineering Contradiction:

Improvebonding surface qualityVSAvoidprocess complexity

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The invention inverts the conventional approach of depositing multiple layers on the active layer to achieve planarity. Instead, the temporary substrate is provided with a pre-formed complementary surface topology through techniques such as molding or 3D printing, eliminating the need for multiple deposition processes.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The complementary surface topology is prepared in advance on the temporary substrate before bonding to the active layer. This preliminary action of pre-forming the matching topology eliminates the need for multiple sequential deposition steps, reducing process complexity and improving productivity.

Inventive Principle:

Principle #10Preliminary action

4Strength

If heat treatment is applied to stabilize bonding layers, then bonding strength is improved, but thermal budget increases and electrical elements are damaged

Engineering Contradiction:

Improvebonding strengthVSAvoidthermal budget

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The invention extracts and eliminates the need for extensive heat treatment by improving the initial bonding interface. The complementary surface topology on the temporary substrate ensures intimate contact and strong bonding from the start, reducing or eliminating the need for high-temperature stabilization treatments that could damage electrical elements.

Inventive Principle:

Principle #2Taking out (Extraction)

5Manufacturing precision

If planarization treatment is applied to the active layer, then bonding surface uniformity is improved, but contaminants and applied strains increase

Engineering Contradiction:

Improvebonding surface uniformityVSAvoidcontaminants and applied strains

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The invention inverts the approach by not treating the active layer surface at all. Instead, the temporary substrate is provided with a complementary surface topology that matches the active layer's original three-dimensional structure, allowing bonding without planarization treatment and thus avoiding the introduction of contaminants and applied strains.

Inventive Principle:

Principle #13The other way round (Inversion)

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 secure transfer of active layers without contamination or stress, protecting electrical components and reducing production costs by eliminating the need for planarization and additional layers, while allowing for the reuse of temporary substrates.

Implementation Method 1

the one side of the temporary substrate having a three-dimensional surface topology complementary to the surface topology of the first side of the active layer such that the surface topology of the temporary substrate encapsulates the surface topology of the active layer

Methodology Applied

Scientific EffectSurface encapsulation:

Data Source

PatentUS9953855B2Process for transferring layers

Publication Date: 2018.04.24 SOITEC SA

AI summary

The invention relates to a process for transferring an active layer to a final substrate using a temporary substrate, the active layer comprises a first side having a three-dimensional surface topology, the process comprising: a first step of bonding the first side of the active layer to one side of the temporary substrate; a second step of bonding a second side of the active layer to the final substrate; and a third step of separating the active layer and the temporary substrate; the process being characterized in that the side of the temporary substrate possesses a surface topology complementary to the surface topology of the first side of the active layer, so that the surface topology of the temporary substrate encapsulates the surface topology of the first side of the active layer in the bonding first step.