How many kinds of common semiconductor materials are there? What are their characteristics?

Common semiconductor materials include silicon (si), germanium (ge) and compound semiconductors, such as gallium arsenide (gaas). Doped or made into other compound semiconductor materials, such as boron (b), phosphorus (p), indium (in) and antimony (sb). Among them, silicon is the most commonly used semiconductor material.

Has the following * * * characteristics:

1. The conductivity of semiconductor is between conductor and insulator.

2. When the semiconductor is stimulated by external light and heat, its conductivity will change significantly.

3. In pure semiconductor, the conductivity will be greatly enhanced by adding a small amount of impurities.