Diffusion current is a type of current that occurs in a semiconductor when there is a concentration gradient of charge carriers. This means that there are more charge carriers in one area of the semiconductor than another, causing them to diffuse or move from an area of high concentration to an area of low concentration.
In a circuit containing a semiconductor but no electric source, diffusion current can still flow and contribute to the overall behavior of the circuit. This current can affect the voltage and current in the circuit, as well as the resistance and capacitance.
Diffusion current and drift current are two types of current that can occur in a semiconductor. Diffusion current is caused by a concentration gradient of charge carriers, while drift current is caused by an electric field. Additionally, diffusion current is typically larger and tends to flow in the opposite direction of drift current.
The magnitude of diffusion current is directly proportional to the concentration gradient of charge carriers in a semiconductor. This means that a larger concentration gradient will result in a larger diffusion current, while a smaller gradient will result in a smaller diffusion current.
Yes, diffusion current can be controlled and manipulated in a circuit by adjusting the concentration gradient of charge carriers in the semiconductor. This can be achieved through processes such as doping or by applying an external electric field.