What is the built in potential?

The depletion region, a crucial aspect of the PN junction, plays a pivotal role in establishing this potential difference. As electrons diffuse across the junction, they leave behind positively charged ions on one side and negatively charged ions on the other, creating a depletion region.

In a state of thermal equilibrium, this depletion region acts as a barrier, preventing further electron diffusion. The potential difference that develops across this region is known as the Built-in Potential, and it serves as a measure of the energy required to overcome this barrier.

The concept of Built-in Potential, also commonly referred to as buil-in voltage, is fundamental in understanding the behavior of electronic devices. It represents a specific potential difference or electric field that arises within certain types of diodes and semiconductor devices.

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This potential difference is a direct consequence of the inherent imbalance between acceptor and donor concentrations within the device. Specifically, it arises when electrons diffuse across the PN junction, a crucial component of these devices.