Target sputtering, as the core technology of surface engineering and thin film technology, refers to the use of ions or other charged particles to hit the target in a high-energy state, thereby triggering the kinetic energy transfer and material transport of target atoms or molecules. The excited atoms or molecules break away from the target surface and are deposited on the substrate in a high-speed motion, forming a thin film with a uniform or specific structure.
1. Classification
(1) DC sputtering
Principle: DC sputtering uses a constant DC power source as the energy source, and is mainly suitable for targets with good conductivity, such as metals.
Features: It has the advantages of simple equipment, easy operation and high deposition rate. This does not apply to insulating materials, as they cannot establish efficient charge transport.
(2) Radio frequency sputtering
Principle: Radio frequency sputtering uses radio frequency power (usually in the MHz range) so that non-conductive materials (such as ceramics, oxides) can also be sputtered.
Features: Able to sputter insulating materials with higher deposition uniformity. However, due to the complex power supply and control system, the cost and maintenance difficulty are relatively high.
(3) Magnetron sputtering
Principle: Based on traditional sputtering, a magnetic field is generated by placing magnets near the target, thereby enhancing the density and stability of the plasma.
Features: Improved sputtering efficiency and film quality, reduced target consumption. Can work at lower air pressure, thereby reducing the impact of gas particles on the film.
(4) Reactive sputtering
Principle: During the sputtering process, reactive gases (such as oxygen, nitrogen) are introduced into the working atmosphere to chemically react with target atoms to form a compound film.
Features: A variety of compound films can be prepared, such as oxides, nitrides, carbides, etc. However, the control is complicated and requires precise adjustment of the flow rate and pressure of the reactive gas.
(5) High power pulse magnetron sputtering
Principle: Use high-power pulse power supply to generate high-density plasma for a short period of time to increase the sputtering rate.
Features: Smoother and denser films can be obtained. But due to high power usage, thermal management and durability of the device become challenges.
2.Application
(1) Semiconductor industry
Sputtering technology is used to deposit conductive, insulating and shielding layers that are critical to the fabrication of high-performance integrated circuits and microelectronic devices.
(2) Optical applications
Mirrors and anti-reflective coatings: Thin films prepared by sputtering techniques can be used to manufacture a variety of optical components such as lenses, lenses and mirrors in laser systems. The light-absorbing layer and conductive layer in solar cells are also often prepared by sputtering.
(3) Decorative coating
Automotive and construction industries: Sputtered films are used for decorative coatings on automotive parts and building materials, not only providing an aesthetic appearance but also increasing the material's wear and corrosion resistance. The casings and decorative parts of consumer electronics such as mobile phones and computers also often use sputtering technology to coat wear-resistant and beautiful films.
(4) Special functional films
It can deposit high hardness and wear-resistant films on the surfaces of tools and molds to extend tool life. Moreover, sputtered films can be used to adjust light transmittance in smart window technology for buildings and automobiles.
(5) Biomedical field
Biocompatible films are generally deposited by sputtering techniques to enhance the compatibility of artificial joints or dental implants with the human body.
FANMETAL can provide customers with various metal sputtering targets, such as Titanium Aluminum Sputtering Targets, Tungsten Targets and Chromium Metal Sputter Targets, etc.
