Indium antimonide has a band gap of 0.23 eV between the valence and the conduction band. Find the temperature at which kT equals the band gap.
Given E=0.23 eV,
K=1.38×10−23
∵ KT=E
⇒ 1.38×10−23×T=0.23×1.6×10−19
T=0.23×1.6×10−191.38×10−23
=0.23×1.6×1041.38
=0.2676×104
=0.267×104=2670