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Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

Assume that the energy released upon the recombination of a hole-electron pair is transformed into electromagnetic radiation. Determine the band gap if the maximum emitted wavelength is 820 nm .

Options

  1. A1.5 eV
  2. B1.1 eV
  3. C0.7 eV
  4. D2.0 eV

Correct answer

A. 1.5 eV

Step-by-step solution

The energy released upon the recombination of a hole-electron pair corresponds to the band gap energy E_g of the semiconductor. The relation between the band gap energy and the maximum emitted wavelength is given by E_g = hc Substituting hc 1240 eV nm and = 820 nm , we get E_g = 1240 820 eV E_g 1.51 eV The calculated band gap is approximately 1.5 eV .

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