A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes.
| Parameter | Energy-difference | |||
| Column 1 | Column 2 | Column 3 | Column 4 | |
| Band-gap | ΔE2 | ΔE1 | ΔE2 | ΔE1 |
| Electron affinity | $$\frac{{\Delta {E_1}}}{2}$$ | ΔE2 - ΔE1 | $$\frac{{\Delta {E_2}}}{2}$$ | ΔE2 - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$ |
| Work function | ΔE1 + ΔE2 | ΔE2 - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$ | ΔE1 - $$\frac{{\Delta {E_2}}}{2}$$ | ΔE2 + $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$ |
A. Column 1
B. Column 2
C. Column 3
D. Column 4
Answer: Option B
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