In copper, the valence band and conduction band overlap, allowing electrons to flow freely and making copper an excellent conductor. In contrast, in materials like silicon and germanium, there is a gap between the valence and conduction bands, making them semiconductors.
At room temperature, the energy band gap of different materials have been listed in the table below. Correctly match the energy band gap (List-I) with the corresponding material (List-II).
LIST-I (Energy band gap) | LIST-II (Material) |
---|---|
A. \( E_g = 0.67 \) eV | I. Polymer |
B. \( E_g = 1.1 \) eV | II. Germanium |
C. \( E_g = 1.43 \) eV | III. Silicon |
D. \( E_g > 5 \) eV | IV. Gallium Arsenide |