Metal sputtering is a plasma-based deposition process used to create thin films on substrates.
The process involves accelerating energetic ions towards a target material, which is typically a metal.
When the ions strike the target, atoms are ejected or sputtered from its surface.
These sputtered atoms then travel towards the substrate and incorporate into a growing film.
How does metal sputtering work? 5 Key Steps Explained
1. Setting Up the Vacuum Chamber
The sputtering process starts by placing the target material and the substrate in a vacuum chamber.
Inert gas, such as argon, is introduced into the chamber.
A power source is used to ionize the gas atoms, giving them a positive charge.
The positively charged gas ions are then attracted to the negatively charged target material.
2. Ion Collision and Sputtering
When the gas ions collide with the target material, they displace its atoms and break them up into a spray of particles.
These particles, referred to as sputtered particles, cross the vacuum chamber and land on the substrate, forming a thin film coating.
The rate of sputtering depends on various factors such as the current, beam energy, and physical properties of the target material.
3. Magnetron Sputtering
Magnetron sputtering is a specific type of sputtering technique that offers advantages over other vacuum coating methods.
It allows for high deposition rates, the ability to sputter any metal, alloy, or compound, high-purity films, excellent coverage of steps and small features, and good adhesion of the films.
It also enables the coating of heat-sensitive substrates and provides uniformity on large-area substrates.
4. Energy Transfer and Sputtering
In magnetron sputtering, a negative voltage is applied to the target material, attracting positive ions and inducing large kinetic energy.
When positive ions collide with the surface of the target, energy is transferred to the lattice site.
If the transferred energy is greater than the binding energy, primary recoil atoms are created, which can further collide with other atoms and distribute their energy via collision cascades.
Sputtering occurs when the energy transferred in a direction normal to the surface is larger than about three times the surface binding energy.
5. Applications and Benefits
Overall, metal sputtering is a versatile and precise process used for creating thin films with specific properties such as reflectivity, electrical or ionic resistivity, and more.
It finds applications in various industries, including microelectronics, displays, solar cells, and architectural glass.
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