Find values of the intrinsic carrier concentration ni for si

Find values of the intrinsic carrier concentration n_i for silicon at -55degreeC, 0degreeC, 20degreeC, 75degreeC, and 125degreeC. At each temperature, what fraction of the atoms is ionized? Recall that a silicon crystal has approximately 5 times 10^22 atoms/cm^3.

Solution

http://scitation.aip.org/content/aip/journal/jap/70/2/10.1063/1.349645
http://scitation.aip.org/content/aip/journal/jap/67/6/10.1063/1.345414