Semiconductor New Material Silicon Carbide Demand Takes Off

wallpapers Innovation 2020-08-13

What is Silicon Carbide

What is sacred silicon carbide? Silicon carbide is a wide bandgap semiconductor material, belonging to the third generation of semiconductor materials. Its band gap is as high as 3.0eV. Compared with the first generation semiconductor material silicon, the band gap of silicon carbide is 3 times that of silicon; the thermal conductivity is 4-5 times that of silicon; breakdown voltage is 8 times that of silicon; electron saturation drift rate is twice that of silicon.

Application of Silicon Carbide in Electric Vehicles

Electric vehicles have become the mainstream of the automotive market. Most electric vehicles still use silicon-based IGBTs as inverter chip modules. This is the mainstream technology of power semiconductors in the field of electric vehicles. However, since Tesla introduced Model 3 and adopted inverters with 24 silicon carbide MOSFETs as power modules, new semiconductor materials such as silicon carbide (SiC) have received more and more attention. At present, the applications of silicon carbide devices in electric vehicles are mainly power control units, inverters, DC-DC converters, and on-board chargers. In 2015, the automobile giant Toyota demonstrated the PCU with all silicon carbide modules. In contrast, the silicon carbide PCU is only 1/5 of the volume of the traditional silicon PCU, the weight is reduced by 35%, the power loss is reduced from 20% to 5%, and the economic efficiency of hybrid vehicles is improved by more than 10%, and the economic and social benefits are very obvious.

Advantages and Disadvantages of Silicon Carbide

Silicon carbide has the advantages of high power, high voltage resistance, high temperature resistance, high frequency, low energy consumption, and strong radiation resistance. In the future, it will be widely used in new energy vehicles, 5G communications, photovoltaic power generation, rail transit, smart grid, aerospace and other fields . But silicon carbide also has huge pain points: it is scarce and expensive, and it is often priceless. At least half of the reason for the extremely mature business environment of traditional silicon-based industries is that silicon materials are relatively easy to obtain. The mature and efficient preparation technology of silicon materials makes silicon materials very cheap at present.