Molybdenum Sulfide

Molybdenum Sulfide sputtering target is a sputtering target with special layer structure, high purity, good electrical and thermal conductivity and other physicochemical properties, which has a wide range of applications in many fields, such as electronics, optics and energy.

Characteristics

Appearance and morphology: Usually black or black-gray powder or lumpy material, its crystal structure is typically layered, each layer consists of molybdenum atoms and sulfur atoms bonded together by covalent bonds to form a structure similar to a sandwich, and the layers interact with each other by weak van der Waals forces.

Density: the density is generally around 4.7-4.8g/cm³, high density target material is conducive to improve the sputtering efficiency, reduce the spattering of particles in the sputtering process and contamination, and also help to improve the uniformity and adhesion of the film.

Hardness: Mohs hardness is 1, relatively soft texture.

Melting and sublimation point: melting point up to 2375 ° C, at 450 ° C will be sublimated, this characteristic makes in some high-temperature applications need to consider its stability and volatilization.

Conductivity: It has a certain degree of conductivity, with a resistivity of 8.51×10-²mΩ・cm, although it is a poor conductor compared with graphite, but this characteristic makes it better able to transfer heat and current during sputtering, which is conducive to maintaining the stability of the sputtering process, and improves the quality and performance of the film, and it can be used as a conductive material or a part of the electrode material in the application of electronic devices. Part.

Thermal conductivity: Good thermal conductivity helps to dissipate heat and prevent localized overheating, thus ensuring the uniformity and stability of the sputtering process, which is important for the preparation of high-quality films.

Optical properties: In the optical field, molybdenum sulfide has certain optical absorption and reflection properties, and can be used to prepare optical films, optical filters, optical detectors and other optical components. In the infrared band, molybdenum sulfide film has a high absorption rate and low reflectivity; in the visible spectral range, by adjusting the thickness and structure of the molybdenum sulfide film, it can realize the reflection, transmittance and absorption of different wavelengths of light.

Chemical stability: at room temperature and pressure, molybdenum sulfide is chemically stable, does not react with corrosive gases except fluorine and high-temperature chlorine and hydrogen; it does not react with acids except aqua regia and hot sulfuric acid and hot nitric acid, and it is stable to the environment, and has good radiation resistance; under normal circumstances, it does not react chemically with the metal surface, nor does it erode rubber.

Redox properties: molybdenum sulfide can be oxidized under certain conditions, such as oxidation at 400 ℃ began to oxidize, 450 ℃ oxidation is significant, 540 ℃ when the oxidation is intense, the oxidation product of molybdenum trioxide and sulfur dioxide; at the same time, molybdenum sulfide can also be hydrogen, carbon and other reductants, such as hydrogen and hydrogen can be generated to generate the molybdenum and hydrogen sulfide, etc. .

Solubility: insoluble in water or binary acid, soluble in hot sulfuric acid, aqua regia, nitric acid.

Adhesion to metal: strong adhesion to metal, strong adhesion is through the sulfur atoms exposed on the outer surface of the molybdenum sulfide molecule and the metal surface, in the sulfur and metal direct bonding, the bonding force will be quite strong, general friction is not easy to peel it off.

Applications

Electronics: In the manufacture of electronic devices, molybdenum sulfide sputtering targets are used to prepare insulating, dielectric or lubricating layers in transistors, integrated circuits, thin-film resistors, thin-film capacitors and other components. For example, in semiconductor chip manufacturing, molybdenum sulfide film can be used as an insulating dielectric layer in metal-insulator-metal (MIM) capacitors, which has a high dielectric constant and low leakage current, and can improve the performance and reliability of the capacitor; in microelectromechanical systems (MEMS), molybdenum sulfide film can be used as a lubricating layer to reduce the friction and abrasion between the components, and to increase the equipment’s life and performance.

Optical field: Molybdenum sulfide has certain optical absorption and reflection properties, and can be used to prepare optical films, optical filters, light detectors and other optical components. For example, in the infrared band, molybdenum sulfide film has a high absorption rate and low reflection rate, can be used as infrared absorption coating or infrared detector sensitive layer, used in infrared imaging, infrared sensing and other fields; in the visible spectral range, by adjusting the thickness and structure of molybdenum sulfide film, can achieve the reflection, transmission and absorption of different wavelengths of light, so as to prepare a variety of colors of optical decorative film or optical Optical filters.

Energy: Molybdenum sulfide sputtering targets are also used in the field of energy storage and conversion. For example, in lithium-ion batteries, molybdenum sulfide can be used as an additive or coating for anode materials to improve the conductivity and stability of the anode material, thus improving the battery’s charging and discharging performance and cycle life; in solar batteries, molybdenum sulfide films can be used as a buffer layer or window layer to improve the photovoltaic conversion efficiency and stability of the battery.

Mechanical engineering: Because molybdenum sulfide has good lubricating properties and low coefficient of friction, so in the field of mechanical engineering, molybdenum sulfide sputtering target can be used to prepare a variety of wear-resistant, friction-reducing coatings, such as in the cutting tool, molds, bearings and other mechanical parts of the surface of the preparation of molybdenum sulfide coatings can reduce the friction between the parts and wear, improve the service life of the parts and efficiency, but also reduce the use of lubricants, reduce environmental pollution. Reduce environmental pollution.