Band Gap

Band Gap

            The band gap of energy level is represented by the valence shell of atom. And valence shell are very close to band. Enough energy is required by electrons. It leaves and become free electrons and exist in it is known as conduction band. The gap in energy between valence electron and conduction band is called energy gap or band gap. The energy that is present in valance electron it is in the form of sequence it has ability to jump from valance band to conduction band. The electrons freely move in conduction band.

            In fig that show the energy diagrams of Conductor, Insulator and Semiconductor. There exist a state in Insulators and Semiconductors there is no free electron is present. The electron jumps in certain conditions because there is no electron is present in this region in fig Band gap. For Insulators, the band gap cross when high voltages is applied and the break down condition is occur. In fig band gap diagram the insulators band gap is also given. In semiconductors the energy gap depends upon the semiconductor materials. In semiconductor the gap is little smaller then insulators and electron can easily jump from valence band to conduction band. The band gap of semiconductor is represented in fig band gap diagram. There is no gap is present in Conductors because the valence and conduction band overhang each other. The band gap is illustrated in fig band gap diagram.