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Question:

The barrier potential of a p-n junction depends on: (a) type of semiconductor material (b) amount of doping (c) temperature. Which one of the following is correct?

(b) and (c) only

(a), (b) and (c)

(a) and (b) only

(b) only

Solution:

The correct option is (a), (b) and (c). The barrier potential depends on the type of semiconductor (for Si, Vb = 0.7 V and for Ge, Vb = 0.3 V), the amount of doping, and also on the temperature.