What elements does polysilicon contain?

Polysilicon is a high-purity semiconductor material primarily composed of silicon. In addition to silicon, polysilicon also contains trace amounts of impurities that can affect the material's electrical and optical properties. The main elements in polysilicon are:

1. Silicon (Si): The primary component of polysilicon is silicon. Silicon is one of the most abundant elements in the Earth's crust. As a non-metallic element, it possesses excellent semiconductor and optical properties, making it widely used in semiconductor materials and solar cells.

2. Oxygen (O): Oxygen is a major impurity element in polycrystalline silicon. It can exist in the form of oxides, which can affect the electrical and optical properties of the silicon material.

3. Carbon (C): Polycrystalline silicon also contains a small amount of carbon. It can exist in the form of carbides, which can affect the lattice structure and electrical properties of the silicon material.

4. Nitrogen (N): Polycrystalline silicon also contains trace amounts of nitrogen. It can exist in the form of nitrides, which can affect the electrical and thermal properties of the silicon material.

5. Phosphorus (P): Polycrystalline silicon also contains trace amounts of phosphorus. It can exist in the form of phosphides, which can affect the electrical and optical properties of the silicon material.

6. Molybdenum (Mo): Polycrystalline silicon also contains a small amount of molybdenum. It can exist in the form of molybdenum compounds, which can affect the electrical and thermal properties of the silicon material.

In addition to the elements mentioned above, polysilicon may contain trace amounts of other impurities, which can affect its performance. Therefore, when producing polysilicon, meticulous raw material control and processing are required to ensure high purity and stability.