The application of MPCVD single crystal diamond in the semiconductor industry and optical field

Single crystal diamond has many excellent physical and chemical properties, such as high hardness, high thermal conductivity, high chemical stability, high optical transmittance, extremely wide bandgap width, negative electron affinity, high insulation, and good biocompatibility. It has shown great potential in the fields of semiconductors and optics.

1. Semiconductor Industry Applications

A. Chip substrate

Since the 1950s, the first generation of semiconductor materials, mainly silicon (Si) and germanium (Ge), have been used for more than 70 years. To this day, more than 95% of semiconductor devices and more than 99% of integrated circuits are still made of silicon materials.

However, due to the physical properties of silicon itself, its application in high-frequency power devices is limited. The second generation semiconductor materials, represented by gallium arsenide (GaAs) and indium phosphide (InP), were popular at the end of the 20th century, but their high price and toxicity limited their applications. Nowadays, third-generation semiconductor materials with ultra wideband gap characteristics, mainly diamond, silicon carbide (SiC), gallium nitride (GaN), etc., have become a hot topic of international competition. The comparison of properties of third-generation semiconductor materials is as follows:

From the above data, it can be seen that as a leader in third-generation semiconductor materials, it has been recognized as the "ultimate semiconductor material" in the industry.

High quality single crystal diamond prepared by the MPCVD method is used as a substrate material in integrated circuit chips, ultra-high frequency high-power electronic devices, biosensors, aerospace and other extreme environmental electronic components. It will significantly improve data transmission rate and conversion efficiency, reduce power consumption, and play a strategic role in many fields such as national defense, aerospace, energy exploration, quantum computers, optical storage, 5G communication, solar energy, automotive manufacturing, semiconductor lighting, smart grids, etc. in the future.

B. Chip heat dissipation material - single crystal diamond heat sink

 With the development of science and the improvement of technological equipment, high-power and high-density devices such as laser diode arrays have been increasingly applied in integrated circuits. However, due to the limited heat dissipation performance of ordinary materials, the temperature continues to rise, greatly reducing their performance and shortening their service life.

Single crystal diamond materials have the highest thermal conductivity among known natural substances and can operate at temperatures above 600 ℃. They are currently the most ideal material for heat dissipation components used in high-end devices with high power density. They can be applied in high-tech fields such as 5G chips, laser diode arrays, high-speed computer CPU chips, multi-dimensional integrated circuits, military high-power radar microwave traveling wave tube thermal support rods, GaN on diamond composite sheets, satellite heat expansion plates, microwave integrated circuit substrates, integrated circuit packaging automatic bonding tool TAB, etc.

2. Single crystal diamond - optical applications

 High quality single crystal diamond prepared by MPCVD method in chemical synthesis and deposition is colorless and transparent, with almost no impurities. It has the widest transmittance spectrum, ranging from 225nm in ultraviolet to 25 μ m in infrared (except for wavelengths of 1.8 μ m-2.5 μ m), as well as excellent transmittance of single crystal diamond in X-ray and microwave ranges, with a transmittance rate of up to 70%.

Single crystal diamond is an ideal material for manufacturing high-precision micro lenses and infrared windows, and has been successfully applied in harsh environments such as aerospace. In addition, single crystal diamond is an excellent crystal Raman material, which enables Raman laser to achieve higher gain, higher power density, and variable wavelength.

At present, CSMH has achieved large-scale production of single crystal diamond through homogeneous epitaxy technology, and has grown high-quality iridium single crystal films on sapphire substrates through heteroepitaxy, significantly improving the growth quality of single crystal diamond. CSMH is willing to collaborate with customers to carry out targeted product development and promote the wider application of single crystal diamond.