Question

In the equilibrium state the barrier, potential across a unbiased germanium diode is __________

(a) 0.3 V

(b) 0.7 V

(c) 1.7 V

(d) 0 V

I have been asked this question in an interview.

Question is taken from Power Diodes-2 in chapter Diodes of Power Electronics

Answer 1

The correct choice is (a) 0.3 V

The best I can explain: Barrier potential is due to the charges that establish an electric field across the two junctions.