When P-N junction diode is forward - biased, then

A P-N junction is forward bias its P end is connected to positive terminal of battery while N end is connected to negative terminal of a battery. Under this condition, a greater number of electrons go from N-region to P-region and a greater number of holes go from P-region to N-region. Therefore, major current due to both types of carriers takes place through the junction. This causes a reduction in the height of depletion region. Moreover, the barrier potential is also reduced.