Electron-Beam-Assisted Sputtering for Low-Pressure Thin Film Deposition
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Solution Overview
Problem
Conventional sputtering methods struggle to produce high-quality thin films with fine line widths and reduced defects due to limitations in process pressure and contamination issues, particularly in ion beam sputtering devices, which are complex and have low deposition rates.
Innovation Solution
An electron-beam-assisted sputtering device that maintains low process gas pressure in a vacuum chamber using an electron beam supply module to sustain plasma, minimizing collisions and energy loss of target atoms, and preventing contamination from ion beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional magnetron sputtering is used, then deposition rate is high, but thin film quality is poor with around 5.5 defects per 60 nm
Solution Approach 1:
The patent combines plasma sputtering and electron beam sputtering into a single hybrid device. The plasma source generates ions for sputtering while the electron beam provides additional energy to sustain plasma at lower pressures and enhance atom mobility. This merging allows achieving high deposition rates like magnetron sputtering while obtaining high film quality comparable to ion beam sputtering, resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If ion beam sputtering is used, then thin film quality is high with around 1 defect per 50 nm, but device complexity increases and deposition rate decreases to approximately one-tenth of magnetron sputtering
Solution Approach 1:
The patent introduces plasma as an intermediary medium between the ion beam source and the target. Instead of directly irradiating the target with ions (which requires complex positioning), the ion beam first generates plasma, and then plasma ions continuously bombard the target. This intermediary approach simplifies the device structure by eliminating the need for precise ion beam-to-target alignment while maintaining the high film quality benefits of ion beam sputtering.
3Manufacturing precision
If ion beam sputtering is used, then thin film quality is improved, but cleaning cycles become shorter and maintenance becomes difficult due to contamination in the dielectric chamber
Solution Approach 1:
The patent extracts the contamination-generating component (dielectric chamber from ion beam source) from the system. By using a hybrid plasma-electron beam sputtering approach, the device eliminates the need for a dielectric chamber that accumulates contamination. The electron beam directly generates plasma without requiring a dielectric window, thereby removing the source of maintenance problems while preserving the ability to produce high-quality thin films.
4Loss of energy
If process gas pressure is reduced to minimize collisions, then energy loss of sputtered atoms decreases, but plasma formation becomes difficult
Solution Approach 1:
The patent combines two plasma generation mechanisms: radio frequency (RF) power for initial plasma generation and electron beam heating for plasma sustainment at low pressures. The RF field ionizes the gas to form plasma, while the electron beam provides continuous energy input to maintain plasma density at low pressures. This combination allows the system to achieve low process gas pressures (reducing energy loss of sputtered atoms) while reliably sustaining plasma for continuous sputtering.
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
Achieves high-quality thin films with low surface roughness and reduced defects, comparable to ion beam sputtering, while avoiding contamination and maintaining high deposition efficiency.
Implementation Method 1
an electron beam supply module for supplying electrons toward the surface of the target where the plasma is formed
Implementation Method 2
target atoms, sputtered by strong collision with the target by cations of the process gas present in the plasma formed on a surface of the target, are deposited
Implementation Method 3
a vacuum chamber where process gas for formation of a plasma is filled at a predetermined process gas pressure
Data Source
AI summary
The present disclosure provides an electron-beam-assisted sputtering device and a method therefor, the device adding, as an electron supply means, an electron beam supply module to a conventional plasma sputtering device, so as to lower the process pressure of sputtering, thereby improving the quality of a deposition thin film. The electron-beam-assisted sputtering device of the present disclosure comprises: a vacuum chamber filled, at a certain process gas pressure, with a process gas for plasma formation; a target which is mounted in the vacuum chamber and to which power is supplied; a substrate onto which a sputtered target atom flies and is deposited due to the forceful collision, with the target, of a cation of the process gas present in the plasma formed on the surface of the target; and an electron beam supply module for supplying electrons toward the surface of the target on which the plasma is formed.