Solid State Physics 2013
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Exercise 17-2

Posted by Rebecca on May 16, 2013, 10:26 pm

 Hello, I had a look at problem 17.2 in your book and had some problems with it: 'Estimate the bandgap for the semiconductor and the concentration of donor ions'. I think the problem refers to footnote 20: - Case 1/T large => I=0 => n=D, p=0, thus the density of donor ions is about 2.5*10^(19) /m^3 - Case 1/T small, but not near to 0: n=I and thus the equation on the left side in the diagrame should be ln(n)=-B*E_gap + constant and thus, the slope of the line is equal to E_gap/k_B Are these answers correct? Thank you, Rebecca PS: I believe this problem is also in the problem sets, but our tutor refused to go through them in tutorials. I was in your revision lecture this morning and you mentioned that there are usually 1-2 tutors who do that. I know a second or third one...

 Message Thread Exercise 17-2 - Rebecca May 16, 2013, 10:26 pm Re: Exercise 17-2 - Steve Simon May 17, 2013, 7:44 am « Back to index