CBSE 2025, Set 3

Question

Draw energy band diagrams of n-type and p-type semiconductors at temperature $T > 0	ext{ K}$. Show the donor/acceptor energy levels with the order of difference of their energies from the bands.

Edvaya · Accepted Answer

The correct answer is Subjective. The energy band diagrams for n-type and p-type semiconductors at $T > 0	ext{ K}$ are shown below:

![Energy band diagrams](https://www.edvaya.com/images/cbse/physics/2025/set3/q21-energy-band-diagrams-answer.webp)

**For n-type semiconductor:**
* The donor energy level ($E_D$) lies just below the conduction band edge ($E_C$).
* The energy difference is very small, typically $\sim 0.01	ext{ eV}$ for Germanium and $\sim 0.05	ext{ eV}$ for Silicon.
* Electrons are easily excited from $E_D$ to $E_C$ at room temperature.

**For p-type semiconductor:**
* The acceptor energy level ($E_A$) lies just above the valence band edge ($E_V$).
* The energy difference is also very small, typically $0.01	ext{ eV}$ to $0.05	ext{ eV}$.
* Electrons are easily excited from the valence band to $E_A$, leaving behind holes in the valence band.

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Physics > Modern Physics > Semiconductor Electronics

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