Difference between intrinsic and extrinsic materials?

Intrinsic materials are materials whose electrical properties are determined solely by the properties of the material itself, without the influence of external factors such as temperature, impurities, or crystal defects. These materials are typically semiconductors or insulators, and their electrical properties are determined by the band structure of the material.

Extrinsic materials are materials whose electrical properties are influenced by external factors such as temperature, impurities, or crystal defects. These materials are typically semiconductors, and their electrical properties can be changed by changing these external factors. For example, the electrical conductivity of a semiconductor can be increased by adding impurities, or by increasing the temperature.

The main difference between intrinsic and extrinsic materials is that the electrical properties of intrinsic materials are determined solely by the properties of the material itself, while the electrical properties of extrinsic materials are influenced by external factors. This difference can be exploited in the design of electronic devices, such as transistors and solar cells.