Consider a n-type semiconductor whose $\mathrm{E}_{\mathrm{v}}=0$, $\mathrm{E}_{\mathrm{C}}=2.0\,\mathrm{eV}$ and $\mathrm{E}_{\mathrm{D}}=1.98\,\mathrm{eV}$. The correct statement among the following is
(a)$\mathrm{E}_{\mathrm{F}}=1\,\mathrm{eV}$ and is independent of T
(b)$\mathrm{E}_{\mathrm{F}}=1.99\,\mathrm{eV}$ and remains independent of T
(c)$\mathrm{E}_{\mathrm{F}}=1.99\,\mathrm{eV}$ and increases towards 2.0 eV with increase of T
(d)$\mathrm{E}_{\mathrm{F}}=1.99\,\mathrm{eV}$ and decreases with increase of T.
Answer
Answer: D ✓ checked by 4AB · confidence medium
Explanation
E_F starts midway between E_D and E_C (1.99 eV) and falls toward midgap as T rises (d).