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MHT CET202310 May 2023Evening ShiftPhysicsSemiconductorsActual

A pure Si crystal has 4 10²⁸ atoms per m ^3 . It is doped by 1 ppm concentration of antimony. The number of free electrons available will be

Options

  1. A4 10³⁴ ~m ⁻³
  2. B4 10²⁸ ~m ⁻³
  3. C4 10²² ~m ⁻³
  4. D4 10²⁰ ~m ⁻³ .

Correct answer

C. 4 10²² ~m ⁻³

Step-by-step solution

Given: Density of Si atoms =4 10²⁸ atoms / m ^3 After doping with 1 ppm of Sb, aligned No. of Sb atoms & = 4 10²⁸ 10^6 & =4 10²² aligned The above number of Sb atoms donates 1 electron each. The total number of free electrons will be 4 10²² ~m ⁻³

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