Cluster Ion Source for Precision Charged Particle Beam Processing
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Solution Overview
Problem
Current methods for applying protective layers using charged-particle beams are slow and cause significant surface damage during nanotechnology processing, especially in soft materials, due to the inherent damage caused by ion beams and the imprecision of existing application methods.
Innovation Solution
Employing a cluster ion source to deposit or etch materials, which reduces substrate damage by using clusters to decompose precursor gases or directly deposit protective layers, allowing for precise and localized application without damaging the work piece surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a charged-particle beam (ion beam or electron beam) is used to process a work piece, then sub-micron precision and very small spot formation are achieved, but significant surface damage and alteration of the work piece occurs
Solution Approach 1:
The invention segments the ion beam into multiple smaller sub-beams arranged in a pattern, which then combine to form the final focused spot. This segmentation allows the beam to be distributed in a way that reduces peak intensity and minimizes surface damage while maintaining sub-micron precision spot formation.
Solution Approach 2:
The patent introduces a precursor gas as an intermediary medium between the ion beam and the work piece surface. The ion beam first interacts with the precursor gas to generate reactive species, which then deposit or etch the work piece material. This intermediary approach reduces direct ion-surface collisions and associated damage.
2Ease of manufacture
If a focused ion beam is used to cut a thin sample for TEM, then sample preparation is achieved, but significant damage and alteration of the sample occurs
Solution Approach 1:
The patent uses precursor gas as an intermediary to enable sample thinning and preparation. Instead of direct ion beam milling that causes significant damage, the ion beam activates the precursor gas which then facilitates material removal through chemical reactions, reducing sample damage while maintaining preparation capability.
Solution Approach 2:
The invention replaces the mechanical sputtering process with a chemically-assisted process. The ion beam provides energy to activate precursor gas molecules, which then chemically react with the sample material to facilitate removal. This substitution reduces the mechanical impact damage inherent in traditional ion beam milling.
3Productivity
If conventional charged-particle beam methods are used for nanotechnology processing, then material deposition and etching are achieved, but surface alteration and damage to soft materials occurs
Solution Approach 1:
The patent introduces precursor gas as an intermediary that mediates between the charged-particle beam and the work piece surface. The beam activates the precursor gas to generate reactive species that perform the deposition or etching functions, reducing direct beam-surface interactions and associated surface alteration.
Solution Approach 2:
The invention changes the operational parameters by using lower beam currents and introducing precursor gas partial pressures. This parameter change shifts the processing mechanism from direct physical sputtering to chemically-assisted processes, maintaining productivity while reducing surface damage to soft materials.
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 cluster ion source method significantly reduces surface damage and enables rapid, accurate application of protective layers, maintaining the integrity of the work piece surface during charged-particle beam processing, especially in nanotechnology applications.
Implementation Method 1
using clusters to decompose precursor gases or directly deposit protective layers
Implementation Method 2
a cluster beam provides energy to decompose a precursor gas to deposit a layer
Implementation Method 3
a cluster beam provides energy to decompose a precursor gas to deposit a layer
Data Source
AI summary
A cluster source is used to assist charged particle beam processing. For example, a protective layer is applied using a cluster source and a precursor gas. The large mass of the cluster and the low energy per atom or molecule in the cluster restricts damage to within a few nanometers of the surface. Fullerenes or clusters of fullerenes, bismuth, gold or Xe can be used with a precursor gas to deposit material onto a surface, or can be used with an etchant gas to etch the surface. Clusters can also be used to deposit material directly onto the surface to form a protective layer for charged particle beam processing or to provide energy to activate an etchant gas.