At present, compound semiconductors are mainly composed of the following four materials: gallium arsenide (GaAs), silicon carbide (SiC), gallium nitride (GaN), indium phosphide (InP) and sapphire (Sapphire). Among them, gallium arsenide (GaAs), which is mainly used in LEDs and other optoelectronic semiconductors, has suffered a slight decline in demand due to the recent trade friction between China and the United States. On the other hand, the demand for GaAs could take off due to electronic devices used in 5G.