Register to reply

Electron-hole recombination

by Goodver
Tags: electronhole, recombination
Share this thread:
Apr29-14, 12:25 AM
P: 53
I understand that electron-hole produced when certain energy in form of a photons applied to atom that electron can escape.

But, why would free electron fall back to the hole if it has more energy than energy on valence band? How recombination happens? Or it is because it collides with other electrons in this atom, than why dont they escape then?

Phys.Org News Partner Physics news on
New complex oxides could advance memory devices
'Squid skin' metamaterials project yields vivid color display
Scientists control surface tension to manipulate liquid metals (w/ Video)
Simon Bridge
Apr29-14, 01:37 AM
Sci Advisor
HW Helper
Simon Bridge's Avatar
P: 13,110
Everything seeks the lower energy state - if one is available.
Apr29-14, 08:35 AM
P: 53
Thanks Simon. Is there a mathematical or physical proof of this phenomena?

Apr29-14, 09:24 AM
Sci Advisor
P: 3,633
Electron-hole recombination

It is all a question of entropy maximization. The energy will finally get distributed over a continuum of photon states due to the coupling of electric dipole moment to the electric field. The large number of photon states have a higher entropy.

Register to reply

Related Discussions
Semiconductor has electron and hole, why not conductor has hole? General Physics 3
Help explaining the ion-electron recombination process General Physics 4
Electron-hole recombination Atomic, Solid State, Comp. Physics 1
Electron and hole conduction Chemistry 0
Black hole electron High Energy, Nuclear, Particle Physics 11