Q2 of 71 Page 418

In a pure semiconductor, the number of conduction electrons is 6 × 1019 per cubic metre. How many holes are there in a sample of size 1 cm × 1cm × 1 mm?


Given: Number of conduction electrons


Since in pure semiconductor the number of holes = number of conduction electron


∴ number of holes


∴ number of holes in


∴ answer is


More from this chapter

All 71 →
10

An AND gate can be prepared by repetitive use of

 1

Calculate the number of states per cubic metre of sodium is 3s band. The density of sodium is 1013 kg m–3. How many of them are empty?

 3

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.

 4

The band gap for silicon is 1.1 eV.

(a) Find the ratio of the band gap to kT for silicon at room temperature 300 K.


(b) At what temperature does this ratio become one tenth of the value of 300 K? (Silicon will not retain its structure at these high temperatures)