Question

The following diagram shows energy bands in a semiconductor.

(a) Which diagram shows energy band positions at OK?

(b) What do you mean by energy gap? Match the elements /compounds with their respective energy gap values.

Column I	Column II
A. Diamond	1. 6 eV
B. Aluminium	2. 0.03 eV
C. Germanium	3. 1.1 eV
D. Silicon	4. 0.71 eV

(c) Classify solids into conductors, semiconductors, and insulators by drawing energy diagram.

Answer 1

(a)

(b) The gap between the top of the valence band and bottom of the conduction band is called the energy band gap.

Column I	Column II
A. Diamond	1. 1.1 eV
B. Aluminium	2. 0.71 eV
C. Germanium	3. 0.03 eV
D. Silicon	4. 6 eV

(c) For conductors

For Insulators

For Semiconductors