Reverse Biased PN Junction. When the positive terminal of a voltage source is connected to the n-type region and the negative terminal of the source is connected to the p-type region. The PN junction is said to be in reverse biased condition. ... Hence, the PN junction is widened.

What happens in reverse bias of pn junction?

In reverse bias a voltage is applied across the device such that the electric field at the junction increases. The higher electric field in the depletion region decreases the probability that carriers can diffuse from one side of the junction to the other, hence the diffusion current decreases.

When the PN junction is reverse biased?

Hint: A p-n junction is said to be in reverse bias if the p-side of the junction is connected to a negative terminal of a battery and the n side is connected to the negative side of the battery.