Question
Download Solution PDFThe barrier potential can be calculated by _________ (where, the symbols have their usual meaning).
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBarrier Potential
The barrier potential in a pn junction diode is a barrier that does not allow charge to flow across the junction normally.
It is the forward voltage at which the current through the PN junction starts to increase rapidly.
The barrier potential is calculated by:
\(E_o={kT\over q}ln({N_DN_A\over n_i^2})\)
where, K = Boltzmann's constant
T = Temperature
q = Charge
NA = Concentration of acceptor impurities
ND = Concentration of donor impurities
ni = Intrinsic concentration
The barrier potential of the "Germanium" diode is 0.3 V and that of a "Silicon" diode is 0.7 V.
The V-I characteristic of both Ge and Si is as shown:
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