The barrier potential of a p-n junction depends on:
(i) type of semiconductor material
(ii) amount of doping
(

Question

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

Accepted Answer

1. **Type of Semiconductor Material:** The barrier potential inherently depends on the bandgap of the material used. For instance, at room temperature, it is approximately $0.7	ext{ V}$ for Silicon and $0.3	ext{ V}$ for Germanium.
2. **Amount of Doping:** The built-in potential barrier is determined by the concentration of acceptor atoms in the p-region and donor atoms in the n-region. Higher doping concentrations lead to a higher barrier potential.
3. **Temperature:** The barrier potential is temperature-dependent because the intrinsic carrier concentration changes with temperature. Specifically, the barrier potential decreases as the temperature increases.
4. **Conclusion:** Therefore, the barrier potential depends on all three factors: the type of material, the amount of doping, and the temperature.

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