Arsenic (As)

Arsenic (As) is a chemical element with the symbol As and atomic number 33. In MBE systems, arsenic can be used as a dopant, which means it is introduced in small amounts to a semiconductor material in order to alter its electrical properties. Arsenic is a p-type dopant, which means it introduces positive charge carriers (holes) into the material, making it more conductive. This is useful for creating p-type semiconductors, which are used in electronic devices for their ability to conduct electrical current. Arsenic can also be used as a material in the construction of the vacuum chamber and other components in MBE systems.

There are several types of arsenic that can be used as a source in MBE systems, including:

1. Arsenic metal: This is a solid form of arsenic that can be evaporated in an MBE system.
2. Arsenic compounds: Arsenic can also be used in the form of compounds such as arsenic trichloride (AsCl3) or arsenic oxychloride (AsOCl). These compounds can be evaporated in an MBE system to deposit arsenic onto the substrate.
3. Arsenic oxide: Arsenic oxide (As2O3) can be used as a source in MBE systems, either as a solid or as a vapor. It can be evaporated using a resistive heating source or a laser.
4. Arsenic telluride: Arsenic telluride (As2Te3) is a compound that is often used as a source in MBE systems for depositing thin films of tellurium. It can be evaporated using a resistive heating source or a laser.
5. Arsenic selenide: Arsenic selenide (As2Se3) is another compound that is often used as a source in MBE systems for depositing thin films of selenium. It can be evaporated using a resistive heating source or a laser.