I would like to know why does the depletion region gets shrinked when a potential is given to a diode(Forward Bias).Is it because we have given a higher voltage than the voltage of the depletion region?But still how does that voltage turn out to break the depletion region?Could anyone help me.
Without any voltage between the diode terminals there is an internal voltage across the pn junction caused by diffusion (diffusion voltage). This voltage leads to a stop of the diffusion process and causes a state of equilibrium - and results in a zone of depletion. Now - when we connect a voltage between the outer terminals in a direction opposite to the diffusion voltage the depletion zone is shrinked because the outer voltage acts against the internal diffusion voltage (two voltages in series with different polarities). The polarity of this voltage is called "forward bias".