Semiconductors can be broadly classified into Intrinsic and Extrinsic Semiconductors.
Intrinsic Semiconductors start conducting at temperatures above the room temperature, but what about below room temperature using electronic devices with these then can pose a problem. This led to a need for improving the conductivity of intrinsic semiconductors and led to the development of extrinsic semiconductors.
After some experiments, scientists observed an increase in the conductivity of a Semiconductor when a small amount of impurity was added to it. These materials are called Extrinsic Semiconductors or impurity Semiconductors.
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