Does n type doping decrease or increase the bandgap?

[Sophia111]

Hi,
I understand that a n type doping will increase the number of electrons, and those electrons will go to the conduction band since the valence band is already filled. I don't exactly understand the effect on the bandgap. Thanks!

 

[Useful nucleus]

In dilute limit, neither n-type nor p-type doping would change the band gap. The effect of heavy doping on the band gap is not trivial to describe and is an active research topic.

 

[Sophia111]

Thanks!