Perovskite Single-Crystal Membrane Release via Etchable Sacrificial Layer

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Solution Overview

Problem

Existing methods for producing free-standing single-crystal membranes face challenges in controlling stress states and are prone to damage during separation from substrates, limiting the flexibility and quality of the membranes.

Innovation Solution

The use of an oxygen-deficient perovskite sacrificial layer with an ACuO2 structure, such as SrCuO2, allows for selective etching in various environments using etchants like distilled water and acids/bases, enabling the production of high-quality, flexible free-standing single-crystal membranes with controlled strain states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If physical separation method is used to separate membrane from substrate, then membrane can be freed from substrate clamping effects, but membrane may be damaged during separation process

Engineering Contradiction:

Improvemembrane integrityVSAvoiddamage during separation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A sacrificial layer is introduced as an intermediary between the substrate and the membrane. This layer can be chemically removed through etching, allowing the membrane to be separated from the substrate without direct mechanical force that would cause damage. The sacrificial layer acts as a temporary mediator that facilitates clean separation while preserving membrane integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If sacrificial layer is used for chemical etching separation, then membrane can be separated without damage, but etching environment is limited to specific conditions

Engineering Contradiction:

Improvedamage during separationVSAvoidetching environment flexibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical composition and stoichiometry of the sacrificial layer to change its etching properties. By adjusting parameters such as oxygen content, cation ratios, and crystal structure of the sacrificial layer, the material can be made responsive to different etching environments including acidic, basic, and neutral conditions, thereby expanding the versatility of the separation process.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If Sr3Al2O6 sacrificial layer is used, then membrane can be separated by water etching, but layer only etches in oxygen-deficient state

Engineering Contradiction:

Improvewater etching capabilityVSAvoidetching condition flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent employs composite sacrificial layer structures or combines multiple materials with complementary etching properties. This allows the sacrificial layer to exhibit both water solubility for easy separation and responsiveness to other etching environments, thereby achieving both ease of operation and etching condition flexibility simultaneously.

Inventive Principle:

Principle #40Composite materials

4Ease of operation

If (La,Sr)MnO3 sacrificial layer is used, then membrane can be separated by acid etching, but layer only etches in acidic solutions

Engineering Contradiction:

Improveacid etching capabilityVSAvoidetching condition flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

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, flexible free-standing single-crystal membranes with controlled strain states, allowing for adjustable physical properties and transfer without damage, using etchants like distilled water and acids/bases.

Implementation Method 1

selective removal of the sacrificial layer using an etchant

Methodology Applied

Scientific EffectChemical etching:

Implementation Method 2

epitaxial growth of a single-crystal membrane having a perovskite structure on the sacrificial layer

Methodology Applied

Scientific EffectEpitaxial growth: Epitaxy

Data Source

PatentUS12612711B2Method for manufacturing free-standing single-crystal membrane having perovskite structure, and method for transferring free-standing single-crystal membrane having perovskite structure

Publication Date: 2026.04.28 UNIV OF ULSAN FOUND FOR IND COOPERATION

AI summary

The present invention provides a method for manufacturing a free-standing single-crystal membrane having a perovskite structure, the method comprising: applying an oxygen-deficient perovskite sacrificial layer having an ACuO2 structure (where A is at least one selected from the group consisting of calcium (Ca), strontium (Sr), and barium (Ba)) on a substrate; epitaxially growing a single-crystal membrane having a perovskite structure on the sacrificial layer; and selectively removing the sacrificial layer using an etchant, and provides a method for transferring a free-standing single-crystal membrane having a perovskite structure by using the method for manufacturing a free-standing single-crystal membrane having a perovskite structure.