China graphite for sale Manufacturers, Suppliers, Factory

Japan recently restricted exports of 23 types of semiconductor manufacturing equipment. The announcement has sent ripples across the industry, as the move is expected to have a significant impact on global supply chains for semiconductor manufacturing.

In November 2023, Semicorex released 850V GaN-on-Si epitaxial products for high-voltage, high-current HEMT power device applications. Compared to other substrates for HMET power devices, GaN-on-Si enables larger wafer sizes and more diversified applications, and it can also be quickly introduced into the mainstream silicon chip process in fabs, which is a unique advantage for improving the yield of power devices.

As a third-generation semiconductor material, Gallium Nitride is often compared with Silicon Carbide. Gallium Nitride still demonstrates its superiority with its large bandgap, high breakdown voltage, high thermal conductivity, high saturated electron drift velocity and strong radiation resistance. But it is undeniable that, like Silicon Carbide, Gallium Nitride also has various technical difficulties.

Currently, many semiconductor devices employ mesa device structures, which are predominantly created through two types of etching: wet etching and dry etching. While the simple and rapid wet etching plays a significant role in semiconductor device fabrication, it has inherent drawbacks such as isotropic etching and poor uniformity, which result in limited control when transferring small-sized patterns. Dry etching, however, with its high anisotropy, good uniformity, and repeatability, has become prominent in semiconductor device fabrication processes. The term “dry etching” broadly refers to any non-wet etching technology used for removing surface materials and transferring micro and nano patterns, including laser etching, plasma etching, and chemical vapor etching. The dry etching discussed in this text specifically pertains to the narrow application of processes using plasma discharge—either physical or chemical—to modify material surfaces.

Silicon nitride (Si3N4) is a key material in the development of advanced high-temperature structural ceramics.

Homoepitaxy and heteroepitaxy play pivotal roles in material science. Homoepitaxy involves the growth of a crystalline layer on a substrate of the same material, ensuring minimal defects due to perfect lattice matching. In contrast, heteroepitaxy grows a crystalline layer on a different material substrate, which can lead to challenges like lattice mismatch. These processes are crucial in advancing semiconductor devices and thin films. For instance, heteroepitaxy significantly impacts microelectronics and quantum optics, contributing to innovations like Light Emitting Diodes.