mobility!!!:-

mobility!!!:-
it might seem confusing to claim electronmobility is greater than hole mobility. infact it is true as for a a undoped semiconductor e mobility is twice hole's... HOW

its just the way we define holes and electrons
hole is a vacancy of electron...

but the electrons which generate holes and what we call hole current are different from the electrons that constitute wha we call electron current...

hole current is hue to electron vacancies in valance band...

electron current is due to flow of electrons in conduction band...

so the mobility issue is therefore obvious... hope thats clear...

When we are talking about hole mobility we are not taking about positive ion mobility. So mass goes out of the window. Yes, the energy required to move a hole is much more than the electron, and that as has been vaguely pointed out in mails earlier is the leading cause of slow hole mobility, but physically, electron moves as a body, and hole moves as an empty space through the atomic structre with a pull against the move from all the atoms surrounding it.

Thats my thinking, that hole gets electric field exerted resistance from pull all around.