Semiconductors

A forum designed mainly for high school physics students in New South Wales, Australia.
saniya
Posts: 6
Joined: Fri Oct 01, 2010 11:04 pm

Semiconductors

Postby saniya » Sat Oct 30, 2010 7:05 pm

Hi,

Could you explain what it means to reach the conduction band in terms of n-type semiconductors.
What I mean is : i know that the n-type semiconductors are doped with a group 5 atoms, so that the 4/5 electrons pair with the 4 valence electrons of the semiconductor atom. Hence, in order for current to flow, the unpaired electron moves to the donor level. This is where I'm stuck. What is the donor energy level? What about the conduction energy level? I'm unable to properly visualise this concept of energy levels in terms of n-type semiconductors. How does knocking out neighbouring electrons allow the electron to reach the conduction band?

Please reply asap!
Thankyou :)

saniya
Posts: 6
Joined: Fri Oct 01, 2010 11:04 pm

Re: Semiconductors

Postby saniya » Sat Oct 30, 2010 7:09 pm

Also, if the conduction band and the valence band are energy levels; does that mean that the electrons that are extra/unpaired have greater energy because they occupy the conduction band?

Thanks :)


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