# Semiconductors, number density of charge carriers.

1. May 11, 2014

### elevenb

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

It's the third part which I'm stuck on.

2. Relevant equations

3. The attempt at a solution

I've substituted in all the numbers and, multiplied by the density but I am still not getting the correct answer; where a I going wrong?

I got

6.13*(10^11) m^-3

1.6*(10^12) m^-3

2. May 11, 2014

### Staff: Mentor

"Third part" means the undoped silicon?
There is no way to tell if you just show your answer instead of the actual work.
What did you use as room temperature?

3. May 11, 2014

### elevenb

I took 298K as room temperature; and yes sorry I meant the part with the undoped silicon.

4. May 11, 2014

### Staff: Mentor

That is the number of electrons. You also have holes as charge carriers.

I get the given answer as rounded result with 300K instead of 298K.

5. May 11, 2014

### elevenb

Ahh the holes! I completely forgot, kicking myself now! Thank you!