The graph of potential barrier versus width of depletion region for an unbiased diode is shown in A. In comparison to A, graphs B and C are obtained after biasing the diode in different ways. Identify the type of biasing in B & C and justify your answer.
Dear student,
Diode B is reverse biased and Diode C is forward biased.
When the diode is reverse biased, the barrier height increases as the direction of applied voltage (V) and the direction of barrier potential (VG) is same. The effective barrier height under reverse biased is (Vo + V).
As the direction of an applied voltage is opposite to the barrier potential, therefore, the effective barrier height is reduced to (Vo - V).
Regards
Diode B is reverse biased and Diode C is forward biased.
When the diode is reverse biased, the barrier height increases as the direction of applied voltage (V) and the direction of barrier potential (VG) is same. The effective barrier height under reverse biased is (Vo + V).
As the direction of an applied voltage is opposite to the barrier potential, therefore, the effective barrier height is reduced to (Vo - V).
Regards