Monocrystalline TEM Grid Assembly for Aligned Epitaxial Growth
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Solution Overview
Problem
Existing TEM grids face challenges in achieving high-quality epitaxial growth and stability for electronic components due to misalignment of crystal orientations between the substrate and membrane, leading to defects and reduced performance.
Innovation Solution
A method involving the use of monocrystalline substrates and membranes with aligned crystal orientations, combined with diffusion welding and epitaxial deposition, to create a TEM grid that supports high-quality epitaxial growth and reduces tension, utilizing materials like SrTiO3 for improved alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a monocrystalline substrate and membrane with aligned crystal orientations are used, then epitaxial growth quality is improved, but manufacturing complexity increases
Solution Approach 1:
The substrate and membrane are pre-aligned with matching crystal orientations before assembly. This preliminary alignment ensures that when epitaxial growth occurs, the crystal structures are already compatible, eliminating the need for complex post-processing or alignment corrections during manufacturing.
Solution Approach 2:
The invention changes the critical parameter of crystal orientation alignment between substrate and membrane. By selecting materials with matching crystal structures and orientations, the epitaxial growth process achieves high quality without requiring complex manufacturing interventions, as the material parameters themselves ensure compatibility.
2Strength
If diffusion welding is used to attach the membrane to the substrate, then structural integrity is improved, but processing time increases
Solution Approach 1:
Diffusion welding parameters are optimized to achieve strong structural integrity at reduced processing times. By controlling temperature, pressure, and time parameters within specific ranges, the welding process achieves maximum bond strength efficiently, resolving the trade-off between strength and time.
3Stability of the object's composition
If the substrate and membrane are made of the same monocrystalline material with matching crystal orientation, then tension is reduced, but material selection flexibility decreases
Solution Approach 1:
The substrate and membrane are made of the same monocrystalline material with identical or matching crystal orientations. This homogeneity eliminates interface tensions and mismatches that would otherwise arise from material differences, ensuring structural stability and reducing internal stresses in the assembled device.
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
The method results in a TEM grid with low tension and enhanced epitaxial growth capabilities, enabling the production of high-quality electronic components with improved structural integrity and performance.
Implementation Method 1
A method involving the use of monocrystalline substrates and membranes with aligned crystal orientations, combined with diffusion welding and epitaxial deposition
Implementation Method 2
Epitaxial growth refers to the process by which a crystalline thin film layer is grown on a crystalline substrate or membrane such that the grown thin film layer mimics the crystal structure and orientation of the underlying substrate
Data Source
Figure 1~2
AI summary
The invention refers to a method of manufacturing a TEM grid comprising the sequence of: creating a hole (3) through a monocrystalline substrate (1), attaching a monocrystalline membrane (2) to the substrate (1), wherein the substrate (1) and the membrane (2) are made of the same monocrystalline material. The invention further refers to a TEM grid comprising a monocrystalline substrate (1) and a monocrystalline membrane (2) which is attached to the substrate (1), wherein the substrate (1) and the membrane (2) are made of the same monocrystalline material, preferably SrTiO3.