Question:

A p -type semiconductor has acceptor level $66 \,meV $ above the valence band. The maximum wavelength of light required to create a hole is very near to :

Updated On: Jul 5, 2022
  • $2\times10^{-5}m$
  • $2\times10^{-6}m$
  • $2\times10^{-8}m$
  • $2\times10^{-10}m$
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The Correct Option is A

Solution and Explanation

$E=66 meV =66 \times 10^{-3}\, eV$ $E=\frac{h c}{\lambda}$ $ \Rightarrow \lambda=\frac{h c}{E}$ $\lambda=\frac{6.625 \times 10^{-34} \times 3 \times 10^{8}}{66 \times 10^{-3} \times 1.6 \times 10^{-19}}$ $\lambda=0.188 \times 10^{-4} \,m$ $\lambda=1.88 \times 10^{-5}\, m$ $ \approx 2 \times 10^{-5} \,m$
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Concepts Used:

Semiconductors

Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.

Properties of Semiconductor:

  1. Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
  2. Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
  3. Lesser power losses.

Uses of Semiconductor:

  1. Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
  2. Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.