List of top Material Science and Technology Questions on Energy bands

The energy gap between the top of the valence band and bottom of the conduction band is called the energy band gap \((E_g)\). Depending upon the materials, the gap can be:

The ratio of charge carrier densities in a pure silicon crystal at \(27^\circ \text{C}\) and \(57^\circ \text{C}\) is 1.25. The energy gap of the semiconductor is:

A semiconductor has acceptor levels \(57 \, \text{meV}\) above the valence band. The maximum wavelength of light which can excite an electron is:

The energy of a photon of sodium light (\(\lambda = 589 \, \text{nm}\)) is equal to the band gap of a semiconducting material. The minimum energy required to create a hole-electron pair is: