Depletion Region

The depletion region is a boundary within a semiconductor device, like a diode, where no free charge carriers (electrons or holes) are present. It forms at the junction of two different types of semiconductor materials, typically p-type and n-type, due to electrons moving and creating an area free of mobile charges. This region acts as an electric barrier, controlling the flow of current. Its width and properties influence how the device behaves, allowing current to flow in one direction while blocking it in the other, which is essential for rectification and electronic signal control.