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A G e specimen is doped with A l . The concentration of acceptor atoms is ~ 10 21 a t o m s m - 3 . Given that the intrinsic concentration of electron-hole pair at this temperature is ~ 10 19 m - 3 , the concentration of electrons in the specimen is:

Options

  1. A10 17   m - 3
  2. B10 15   m - 3
  3. C10 4   m - 3
  4. D10 2   m - 3

Correct answer

A. 10 17   m - 3

Step-by-step solution

n e = n i 2 N A = 10 19 2 10 21 n e = 10 17   m - 3

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