Sputtering is a thin film deposition process used in the manufacturing of semiconductors, disk drives, CDs, and optical devices.
It involves the ejection of atoms from a target material onto a substrate due to bombardment by high-energy particles.
Summary of the Answer:
Sputtering is a technique for depositing thin films of material onto a surface, known as a substrate.
This process begins by creating a gaseous plasma and accelerating ions from this plasma into a source material, or target.
The energy transfer from the ions to the target material causes it to erode and eject neutral particles, which then travel and coat a nearby substrate, forming a thin film of the source material.
Detailed Explanation:
1. Creation of Gaseous Plasma
Sputtering starts with the creation of a gaseous plasma, typically in a vacuum chamber.
This plasma is formed by introducing an inert gas, usually Argon, and applying a negative charge to the target material.
The plasma glows due to the ionization of the gas.
2. Acceleration of Ions
The ions from the plasma are then accelerated towards the target material.
This acceleration is often achieved through the application of an electric field, which directs the ions to the target with high energy.
3. Ejection of Particles from Target
When the high-energy ions collide with the target material, they transfer their energy, causing atoms or molecules from the target to be ejected.
This process is known as sputtering.
The ejected particles are neutral, meaning they are not charged and will travel in a straight line unless they collide with other particles or surfaces.
4. Deposition onto Substrate
If a substrate, such as a silicon wafer, is placed in the path of these ejected particles, it will be coated with a thin film of the target material.
This coating is crucial in the manufacturing of semiconductors, where it is used to form conducting layers and other critical components.
5. Importance of Purity and Uniformity
In the context of semiconductors, the sputtering targets must ensure high chemical purity and metallurgical uniformity.
This is essential for the performance and reliability of the semiconductor devices.
6. Historical and Technological Significance
Sputtering has been a significant technology since its development in the early 1800s.
It has evolved through innovations such as the "Sputter gun" developed by Peter J. Clarke in 1970, which revolutionized the semiconductor industry by enabling precise and reliable deposition of materials on an atomic level.
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