Discuss Forum
1. At T = OK, the Fermi-level in an n-type semiconductor lies:
- A. Below the donor level
- B. Below the donor level
- C. Below the donor level
- D. Below the donor level
Answer: Option B
Explanation:
At T = 0K, the Fermi level in an n-type semiconductor lies below the donor level, but very close to the conduction band.
Explanation:
In an n-type semiconductor, the donor impurity levels are close to the conduction band. At absolute zero (T=0K), all the electrons in the donor levels are excited and occupy the conduction band, meaning the Fermi level coincides with the donor level. Since a small number of donor electrons may still occupy the donor level at very low temperatures, the Fermi level will be slightly below the donor level and very close to the conduction band.
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