GATE EC 2014 Set 4 — Question 44
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Electronic Devices → Semiconductor Physics → Equilibrium Carrier Concentration
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Question
Consider a silicon sample doped with donor atoms. Assume that the intrinsic carrier concentration . If the sample is additionally doped with acceptor atoms, the approximate number of electrons/ in the sample, at K, will be ______.
Correct answer
224.9 to 225.1
Solution
Given:
Since , the sample is p-type. The net acceptor concentration is:
The hole concentration .Using the mass action law:
.
Since , the sample is p-type. The net acceptor concentration is:
The hole concentration .Using the mass action law:
.
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