Cadmium metal

Cadmium metal sputtering target is a key material used in physical vapour deposition (PVD) technology. It consists mainly of cadmium metal (Cd) and is usually solid in appearance with a metallic lustre.

Characteristics

Appearance: Silver-grey metallic luster, relatively soft texture, belongs to soft metal materials.

Atomic properties: Cadmium has an atomic number of 48 and an atomic weight of 112.411.

Density: Theoretical density is about 8.64 g / cubic centimetre.

Melting point: the melting point is relatively low, about 321 ℃

Thermal conductivity: High thermal conductivity, approx. 97 W/m Kelvin.

Coefficient of Thermal Expansion: Coefficient of thermal expansion is 30.8 x 10-⁶/Kelvin.

Sputtering power: Both direct current (DC) and radio frequency (RF) sputtering modes can be used, but there is a certain maximum power density limitation, generally the maximum power density is about 30 watts / square inch.

Film quality: The film formed by sputtering has good uniformity and denseness, which can meet the requirements of electronics, semiconductors, flat panel displays and other fields on the quality of the film.

Chemical stability: at room temperature, cadmium metal has a certain degree of chemical stability, but in the air for a long time exposure or at high temperatures and other special conditions, it is easy to be oxidised, the surface will form a layer of cadmium oxide film. This oxide film may affect the stability of the sputtering process and the quality of the film, so care needs to be taken to prevent the target from being oxidised during use and storage.

Applications

Electronic component field:

Thin film transistor (TFT): Cadmium metal sputtering target can be used for the preparation of the semiconductor layer or electrode layer and other key components in the TFT. TFT is the liquid crystal display (LCD) and organic light-emitting diode (OLED) displays and other flat-panel display technology core components, cadmium thin film of the electrical properties of cadmium to enable it to play an important role in the TFT, help to improve the resolution, contrast and response speed and other properties of the display. response speed and other properties.

Semiconductor devices: In the manufacture of some semiconductor devices, cadmium films can be used as doping materials or used to form specific functional layers. For example, in the manufacturing process of some semiconductor chips, by sputtering cadmium targets can be formed on the surface of the chip with specific electrical properties of the film, thereby regulating the performance of semiconductor devices.

Electronic connectors: electronic connectors need to have good electrical conductivity and wear resistance, cadmium metal sputtering target can form a layer of uniform cadmium film on the surface of the connector, to improve the electrical conductivity and wear resistance of the connector, to extend its service life.

Optical field:

Optical coating: can be used to manufacture optical lenses, filters, mirrors and other optical components coating. Cadmium films have good optical properties in a specific wavelength range, for example, can enhance the reflectivity or transmittance of optical elements, thus improving the performance of the optical system. For example, in some high-precision optical instruments, the use of cadmium metal sputtering target coating can improve the optical resolution and precision of the instrument.

Solar cells: in the manufacture of thin-film solar cells, cadmium film can be used as a buffer layer or window layer material of the battery. Cadmium’s energy band structure and optical properties enable it to play a role in promoting charge separation and transmission in solar cells, improve the photoelectric conversion efficiency of solar cells.

Protective coating field:

Corrosion-resistant coatings: cadmium metal has good corrosion resistance, in some of the higher corrosion resistance requirements of the metal surface, can be sputtered cadmium target to form a layer of cadmium protective coatings, to protect the metal substrate from corrosive media erosion. For example, in some marine engineering, chemical equipment and other fields, cadmium coating can improve the service life and reliability of equipment.

Lubrication coating: cadmium film has a low coefficient of friction, can be used as a lubrication coating applied to some need to reduce the friction and wear of mechanical parts surface, such as bearings, gears and so on. Cadmium lubrication coating can reduce the friction and wear between mechanical parts, improve the efficiency and reliability of mechanical systems.

Decorative field: the use of cadmium metal sputtering target can be formed on the surface of a variety of materials with a metallic luster and decorative cadmium film, used to decorate handicrafts, jewellery, watches and other items, so that it has a unique appearance and texture.