0

Guest

Courses New

when a semiconductor is heated , does the distance between the conduction band and non conduction band decrease?

when a semiconductor is heated , does the distance between the conduction band and non conduction band decrease?

Grade:12

2 Answers

Arun
25750 Points
4 years ago
The Fermi level is the energy separating occupied states (or levels) of the valence band from empty states (levels) of the conduction band at the absolute temperature T=0 Kelvin.
The Fermi level is an energy level characteristic of the statistics (distribution law) which controls the occupation of any energy state by a given particle: an electron or a hole in semiconductors.
Electrons and holes are both fermion particles ( with half values of the spins) and both of them obey the Fermi-Dirac statistics which becomes asymptotically the Boltzman statistics in dilute systems (with few electrons and or holes) or nondegenerate systems. 
The position of the Fermi level with respect to valence and or conduction bands depends on various parameters as the temperature, the effective masses of electrons and holes, and the number of free electrons and holes.
This variation of the Fermi level obeys two condictions :
- the ''mass action law'' which states that the number of particles of each type as well as the overall number of the particles must conserve whatever is their distribution on the available energy levels.
- The neutrality equation which states that the electrical neutrality has to be fulfilled, i.e. the number of negative charges must be counterbalanced excatly by the same number of positive charges. 
 
Vikas TU
14149 Points
4 years ago
Dear student 
The band gap merely refers to the amount of potential energy (in units of eV, electron volts) that is required for the electrons to cross the channel of a semiconductor.
There is no physical distance between the valence band and the conduction band
Good Luck 

Think You Can Provide A Better Answer ?

Other Related Questions on Electrostatics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More