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NEET2004PhysicsSemiconductorsActual

A Ge specimen is doped with Al . The concentration of acceptor atoms is 10²¹ atoms / m ^3 . Given that the intrinsic concentration of electron-hole pairs is 10¹⁹ / m ^3 , the concentration of electrons in the specimen is

Options

  1. A10¹⁷ / m ^3
  2. B10¹⁵ / m ^3
  3. C10^4 / m ^3
  4. D10^2 / m ^3 .

Correct answer

A. 10¹⁷ / m ^3

Step-by-step solution

When Ge specimen is doped with Al , then concentration of acceptor atoms is also called concentration of holes. Using formula, n_i^2=n₀ p₀ , where aligned n_i= & concentration of electron-hole pair =10¹⁹ / m ^3 & n₀= concentration of electron & p₀= concentration of holes =10²¹ atom / m ^3 & (10¹⁹ )^2=10²¹ n₀ n₀=10¹⁷ / m ^3 . aligned

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