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Electronic Devices and Circuits - Engineering

Q1:

A Si sample is doped with a fixed number of group N impurities. The electron density n is measured from 4 K to 1200 k for the sample. Which one of the following is correct?

A n remains constant over the temperature range

B n increases monotonicaliy with increasing temp

C n increases first remains constant over a range and again increases with increasing temperature

D n increases show a peak and then decrease with temperature

ANS:B - n increases monotonicaliy with increasing temp

The doping concentration is directly proportional to T^3/2 and also to the e^1/t.