The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?
Correct answer: B. 1 atom for 108 atoms
- A. 10 atoms for 108 atoms
- B. 1 atom for 108 atoms
- C. 1 atom for 104 atoms
- D. 1 atom for 100 atoms
Explanation
Only a very small fraction of atoms is replaced by impurity atoms in an extrinsic semiconductor, commonly about one impurity atom per 10^8 semiconductor atoms. This tiny addition can greatly increase carrier concentration.
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