# intrinsic carrier concentration

#### bhuvanesh

Joined Aug 10, 2013
268
In the second step ,in exponential part in denominator we have 0.0258. Here my confusion start we are having this 0.0258 in place of KT(since k is boltz man constant and T is 300K). Even multplying boltzman constant and temperature would not ge that value 0.0258. Help me. Thanks

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#### WBahn

Joined Mar 31, 2012
29,149
What are the units on kT? What are the units on that 0.0258?

#### bhuvanesh

Joined Aug 10, 2013
268
yes,Thanks . Its in ev/k.so 8.617*10^-5 multiply by 300 gives 0.0258. One more doubts see the attached image(question is same as to find intrinsic carrier concentraion for silicon(in cm^-3) at 200k) ,in that what is that (200/300) part ?

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#### WBahn

Joined Mar 31, 2012
29,149
I'm not sure. I can't see enough of the material leading up to this to tell.

My first thought is that it is a ratio of temperatures used to get the value at one temperature based on the value at another temperature. It has been twenty years since I've done anything with this stuff, so the only suggestion I can give is to look for anyplace where some parameter (temperature?) enters into an equation as the cube.