Q94 / 120 · VITEEE 2008 · Physics

When a solid with a band gap has a donor level just below its empty energy band, the solid is

  • A
    an insulator
  • B
    a conductor
  • C
    a p-type semiconductor
  • Correct answer
    D
    an $\mathrm{n}$-type semiconductor

Solution

The solid is an $\mathrm{n}$-type semiconductor. In an n-type semiconductor, the impurity is pentavalent which is also called the Donar impurity because one impurity atom generate one electron. The Donor energy level lies just below the conduction band as shown in the figure. Figure

Hence, the correct answer is option: 'D'.

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