Ion Beam Deposition Substrate Indexing for Uniform Film
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Solution Overview
Problem
Ion beam deposition (IBD) systems experience asymmetrical shadowing and deposition rate variations due to beam divergence, leading to uneven material deposition profiles on substrates with features, which affects the uniformity and symmetry of thin film properties.
Innovation Solution
A substrate processing system with a vacuum chamber and a fixture that allows for the emission of an energetic particle beam with a uniform flux distribution, where the substrate is indexed and translated relative to the beam to ensure symmetrical treatment profiles by aligning features parallel to the beam and rotating the substrate 180° after each cycle to treat both sides uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional IBD system with beam divergence is used, then deposition can be achieved, but asymmetrical shadowing occurs leading to non-uniform deposition profiles
Solution Approach 1:
The substrate is dynamically rotated during deposition to change its angular orientation relative to the beam source. This rotation transforms the static shadowing problem into a dynamic process where different regions of the substrate receive varying beam intensities over time, achieving uniform deposition profiles through temporal averaging of asymmetric spatial distributions.
Solution Approach 2:
The substrate undergoes periodic rotation at controlled speeds during the deposition process. This periodic motion ensures that each point on the substrate surface is exposed to the divergent beam from multiple angles over complete rotation cycles, eliminating asymmetrical shadowing effects and producing uniform deposition patterns.
2Reliability
If the substrate is tilted to optimize IBD film properties, then magnetic properties improve, but non-uniformities are introduced requiring rotation to average out
Solution Approach 1:
The system employs dynamic substrate rotation that couples with the tilted substrate orientation. The rotation dynamically redistributes the deposition flux across the substrate surface, allowing the tilted orientation to maintain optimal magnetic properties while the continuous motion averages out the non-uniformities that would otherwise be introduced by the tilt angle.
Solution Approach 2:
The substrate rotation operates continuously throughout the deposition process, ensuring that the beneficial magnetic properties achieved through tilting are maintained while simultaneously averaging out spatial non-uniformities. This continuous action prevents the formation of localized defects and ensures uniform material distribution across the entire substrate surface.
3Productivity
If beam divergence is present in the IBD system, then deposition rate can be maintained, but asymmetrical shadowing reduces the area over which lift-off is acceptable
Solution Approach 1:
The substrate is rotated periodically during deposition, which redistributes the asymmetric shadowing effects across different regions of the substrate over time. This periodic motion ensures that no single region experiences prolonged exposure to asymmetric shadowing, thereby maintaining acceptable lift-off quality across the entire deposition area while preserving the deposition rate enabled by beam divergence.
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 approach significantly reduces asymmetries in deposition profiles adjacent to features, achieving radial symmetry and uniformity in the deposited material thickness, thereby improving the uniformity and symmetry of thin film properties.
Implementation Method 1
The ion beam 12 sputters material from a finite, well-confined source region on the target 14 to generate a beam 16 of sputtered target material
Implementation Method 2
Ion beam deposition (IBD) are familiar methods for depositing thin film materials
Data Source
AI summary
Method and apparatus for processing a substrate with an energetic particle beam. Features on the substrate are oriented relative to the energetic particle beam and the substrate is scanned through the energetic particle beam. The substrate is periodically indexed about its azimuthal axis of symmetry, while shielded from exposure to the energetic particle beam, to reorient the features relative to the major dimension of the beam.