When it comes to plasma in sputtering, the gas used is typically an inert gas.
Argon is the most common and cost-effective choice among these inert gases.
Inert gases like argon, krypton, xenon, and neon are preferred because they do not react with the target material or the substrate.
They provide a medium for plasma formation without altering the chemical composition of the materials involved.
Which Gas is Used for Plasma in Sputtering? (4 Key Points Explained)
1. Inert Gas Selection
The choice of an inert gas is crucial in sputtering because the gas must not chemically react with the target material or the substrate.
This ensures that the deposition process remains chemically stable and does not introduce unwanted compounds into the deposited film.
Argon is the most commonly used gas due to its availability and cost-effectiveness.
It has a suitable atomic weight that allows for efficient momentum transfer during the sputtering process, which is essential for high sputtering and deposition rates.
2. Plasma Formation
Plasma is created by ionizing the sputtering gas within a vacuum chamber.
The gas is introduced at low pressure, typically a few milliTorr, and a DC or RF voltage is applied to ionize the gas atoms.
This ionization process forms a plasma, which consists of positively charged ions and free electrons.
The plasma environment is dynamic, with neutral gas atoms, ions, electrons, and photons in near equilibrium.
This environment facilitates the energy transfer necessary for the sputtering process.
3. Sputtering Process
During sputtering, the target material is bombarded with ions from the plasma.
The energy transfer from these ions causes particles of the target material to be ejected and deposited onto the substrate.
The sputtering rate, which is the rate at which material is removed from the target and deposited onto the substrate, depends on several factors including the sputter yield, the molar weight of the target, the material density, and the ion current density.
4. Variations in Gas Selection
While argon is the most common choice, the selection of the sputtering gas can be tailored based on the atomic weight of the target material.
For lighter elements, gases like neon might be preferred, while for heavier elements, krypton or xenon could be used to optimize momentum transfer.
Reactive gases can also be used in certain sputtering processes to form compounds either on the target surface, in-flight, or on the substrate, depending on the specific process parameters.
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