Distinguish between intrinsic and extrinsic semi-conductors on the basis of energy band diagram.

Explanation

The energy band diagram of instrinsic semiconductor and extrinsic semiconductor have been shown in Fig. and or .
From these energy band diagrams we note that (i) The energy gap is of 1.1 eV for intrinsic semiconductor and less than 1.1 eV (due to donor energy state or acceptor energy state) for extrinsic semiconductor. (ii) The conductivity of extrinsic semiconductor is more than intrinsic semiconductor because of smaller energy gap for extrinsic semiconductor. (iii) The resistivity of intrinsic semiconductor is more than extrinsic semi-conductor as resistivity is reciprocal of conductivity.