Drawbacks In Intrinsic Semiconductors

Description:

Intrinsic semiconductors are not suitable for the construction of devices due to the following reasons.

Current is controlled by temperature

In intrinsic semiconductors when electrons get thermal energy, electrons move from valence band to conduction band. More will be the thermal energy, more will be the number of electrons in the conduction band, and more will be the current. Hence, current is controlled by temperature and not by us.

Current is very small

Intrinsic semiconductor can conduct only a small amount of current at normal temperature to increase the current the semiconductor should be constantly heated which is not suitable. Hence for devices that require large amount of current, semiconductors cannot be used.

Number of holes equal to number of electrons

For creation of any device, number of electrons should be greater than number of holes or vice versa. But in intrinsic semiconductors as both the number of holes and number of electron are equal, so it is not used.