Germanium Membrane Fabrication Without Porous Layer Reorganization

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Solution Overview

Problem

The fabrication of high-quality germanium-based freestanding membranes (FSM) is challenging due to process complexity, high cost, substrate damage, and contamination issues, particularly when using porous germanium substrates, which often require high-temperature annealing leading to structural reorganization and difficulty in reusing substrates.

Innovation Solution

A method involving low-temperature deposition of a non-porous germanium-based layer on a porous germanium substrate below its reorganization temperature, followed by uncoupling to preserve the porous structure's integrity, allowing for easy substrate reuse and minimal contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If high-temperature annealing is used to deposit material on porous Ge substrate, then material deposition is achieved, but the porous layer undergoes thermal reorganization forming large pillar structures and losing intrinsic PGe properties

Engineering Contradiction:

Improvematerial depositionVSAvoidporous layer structure

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by controlling the deposition temperature to be below the reorganization temperature of the porous layer. This temperature parameter control prevents thermal reorganization of the porous structure while still enabling material deposition, thus resolving the contradiction between achieving material deposition and maintaining porous layer structure stability.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If high-temperature annealing is used to trigger thermal reorganization, then material deposition occurs, but the process complexity and cost increase

Engineering Contradiction:

Improvematerial depositionVSAvoidprocess complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent simplifies the process by changing the temperature parameter from high-temperature annealing to low-temperature deposition below the reorganization temperature. This parameter change eliminates the need for complex high-temperature processing equipment and multiple annealing steps, thereby reducing process complexity and cost while still achieving material deposition.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If high-temperature annealing is used for material deposition, then deposition is achieved, but substrate damage and contamination issues occur

Engineering Contradiction:

Improvematerial depositionVSAvoidsubstrate damage

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent prevents substrate damage by changing the temperature parameter from high-temperature annealing to low-temperature deposition. This parameter change avoids thermal damage to the substrate and prevents contamination issues associated with high-temperature processing, while still enabling successful material deposition on the porous Ge substrate.

Inventive Principle:

Principle #35Parameter changes

4Quantity of substance

If thermal reorganization forms large pillar structures, then material deposition occurs, but the membrane uncoupling interface becomes mechanically weak requiring extensive reconditioning

Engineering Contradiction:

Improvematerial depositionVSAvoidsubstrate reconditioning

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent maintains the porous layer's mechanical strength by controlling the deposition temperature below the reorganization temperature. This parameter change prevents the formation of large pillar structures that would create weak interfaces, thereby maintaining easy membrane uncoupling and eliminating the need for extensive substrate reconditioning processes.

Inventive Principle:

Principle #35Parameter changes

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 method enables the production of high-quality germanium-based FSM with preserved porous structure integrity, facilitating easy substrate preparation for multiple reuses and reducing material consumption and costs.

Implementation Method 1

high temperature annealing steps either before or during the material deposition, triggering the thermal reorganization of the porous layer

Methodology Applied

Scientific EffectThermal reorganization: Annealing

Implementation Method 2

depositing, at a temperature below a porous germanium reorganization temperature, a non-porous layer of germanium-based material on a porous layer of germanium

Methodology Applied

Scientific EffectLow temperature deposition: Physical Vapour Deposition

Data Source

PatentUS20250336671A1Method and system for manufacturing a germanium-based membrane, and germanium-based substrate

Publication Date: 2025.10.30 SCOPRA SCI & GENIE SEC

AI summary

The method of manufacturing a germanium-based membrane generally has: at a first temperature, forming a non-porous layer of a germanium-based material on a porous layer of a first germanium substrate, the first temperature below a reorganization temperature of the porous layer of the first germanium substrate; and uncoupling the non-porous layer of the germanium-based material from the porous layer of the first germanium substrate thereby obtaining the germanium-based membrane and a second germanium substrate comprising porous germanium remnants including germanium crystallites.