# Homework Help: State densities of a semiconductor

1. Aug 14, 2010

### stagger_lee

1. The problem statement, all variables and given/known data

Having some trouble with the following equation, I'm not sure what each term represents.

The problem I have is does c,v have something to do with conduction and valence? But what is N and m? And what does it mean when terms are seperated by a comma?

2. Relevant equations

Nc,v = 2 ((2$$\pi$$mc,vKT)/(h^2))

3. The attempt at a solution

From what I gather;

K=Boltmann's constant
T=Temperature
h=Planck's constant
Nc,v=?????????
mc,v=?????????

2. Aug 14, 2010

### nickjer

Please use latex, since I am guessing the "c,v" are subscripts. In that case you are right about conduction and valence. N is the number of energy levels in either the conduction or valence band (basically density of states) and m is the mass of the carrier.

3. Aug 14, 2010

### stagger_lee

Sorry, i'll make sure I use latex in future.

That's cleared things up for me. Thank you.

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