Question

Expression for extrinsic conductivity

Answer 1

An extrinsic semiconductor is a semiconductor doped by a specific impurity which is able to deeply modify its electrical properties, making it suitable for electronic applications 

Answer 2

Extrinsic Semiconductors. Extrinsic Semiconductors. Extrinsic semiconductors: Intrinsic semiconductors, to which some suitable impurity or doping agent or dopant has been added in extremely small amounts (about 1 part of 108) are called extrinsic or impurity semiconductors.