What is one function of a semiconductor diode?

A semiconductor diode is primarily known for its ability to control the direction of current flow. This device allows current to pass through it in one direction while blocking it in the opposite direction. This unidirectional feature is essential in many electronic circuits, especially in rectification processes, where alternating current (AC) is converted to direct current (DC).

In practical applications, this characteristic makes diodes vital components in power supplies, where they ensure that current flows correctly to power devices, protecting circuits from potential damage that could occur if current were allowed to flow in reverse. This directional control is also leveraged in signal demodulation and signal processing, making diodes fundamental in various radio and communication technologies.