Semiconductors are widely used in consumer, communication systems, medical instruments and other fields. For example, diode is a device that uses semiconductor. From the perspective of science and technology or economic development, the importance of semiconductors is very great. Today, most products, such as computers, mobile phones or digital recorders, are closely related to semiconductors. Common semiconductor materials include silicon, germanium, gallium arsenide, etc. Silicon is one of the most influential semiconductor materials in commercial applications.