Applications of Refractory metals in the semiconductor industry

Refractory metals have a wide range of applications in the semiconductor industry due to their unique physical and chemical properties, such as high melting points, good electrical and thermal conductivity, and stability under extreme conditions. These properties make them crucial materials for manufacturing semiconductor devices and integrated circuits. Here are some specific applications of refractory metals in the semiconductor industry:

1. As targets:

- Metal sputtering targets: For example, tungsten targets, molybdenum targets, etc. Through physical vapor deposition (PVD) technology, atoms on the target are sputtered out and deposited on the substrate of the semiconductor chip to form thin film structures such as conductive layers and barrier layers. These films play key roles such as conduction, connection, and diffusion prevention in semiconductor devices. For example, in integrated circuit manufacturing, tungsten films can be used as filling materials for contact holes and vias in metal interconnect layers, and molybdenum films are often used to make gate electrodes and capacitor electrodes.

- Alloy targets: Some refractory metal alloy targets, such as tungsten-titanium alloy targets, are used as diffusion barrier layers and adhesion layers in semiconductor applications, which can separate the metallization layer from the semiconductor and prevent mutual diffusion between different materials.

2. For parts of semiconductor equipment:

- Heaters: In MOCVD (Metal Organic Chemical Vapor Deposition) equipment, heaters are key core components and need to work under high temperature and precisely controlled temperature conditions. Refractory metals such as tungsten, molybdenum, rhenium, and their alloys have good high-temperature resistance and high thermal conductivity, and are suitable for manufacturing MOCVD heaters, which can provide a stable high-temperature environment for the reaction chamber and ensure the growth quality of semiconductor materials.

- Ion implantation parts: In the semiconductor manufacturing process, ion implantation is an important doping process used to change the electrical properties of semiconductor materials. Refractory metal materials can be used to manufacture key parts in ion implanters, such as ion sources and electrodes, which can withstand the bombardment of ion beams and high-temperature environments and ensure the accuracy and stability of ion implantation.

- Heat sink materials: Semiconductor devices generate a lot of heat during operation and need effective heat dissipation measures to ensure their performance and reliability. Composites composed of refractory metals and other materials, such as tungsten-copper and molybdenum-copper, have high thermal conductivity and good heat dissipation performance and can be used as heat sink materials for heat dissipation of semiconductor devices.

3. Applications in semiconductor packaging:

- Lead frames: Lead frames are an important part of semiconductor packaging and are used to connect semiconductor chips and external circuits. Refractory metal materials have high strength and good electrical conductivity and can be used to manufacture lead frames for high-end semiconductor packaging to meet the requirements of packaging materials for high-performance semiconductor devices.

- Packaging substrates: Refractory metal materials can also be used to manufacture the metal layer in packaging substrates to improve the heat dissipation performance and electrical performance of packaging substrates and provide a better packaging environment for semiconductor chips.

As technology advances, the applications of refractory metals in the semiconductor industry continue to expand, including their use in new semiconductor materials, device structures, and manufacturing processes. The high purity, performance, and stability of these materials are crucial for the progress of semiconductor technology.