In the case of a semiconductor,which of the following statements is wrong?

  • A
    Doping increases conductivity.
  • B
    The temperature coefficient of resistance is negative.
  • C
    Resistivity is between that of a conductor and an insulator.
  • D
    At absolute zero temperature,it behaves like a conductor.

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What is the maximum wavelength of electromagnetic radiation that can create an electron-hole pair in a material with a band gap of $0.7 \ eV$? (Planck's constant $h = 4.136 \times 10^{-15} \ eV \cdot s$,velocity of light $c = 3 \times 10^8 \ m/s$).

Electrical conductivity of a semiconductor:

The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that

The resistivity of a semiconductor depends on $........$.

Explain by drawing the energy levels of $Si$ and $Ge$ containing $N$ atoms at $0\, K$ temperature.

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