Energy Band Diagram
This diagram in the qualitative form is sketched by following the below stated procedure:
1. The semiconductor device is assumed to be formed by bringing together the many distinct semiconductor layers, metals or insulators of which it is made of. The starting point is thus the energy band diagram of all constituent layers.
2. The band diagram of composite device is sketched making use of the fact that after equilibrium, Fermi energy is same everywhere in the system. The equalization of the Fermi energy is accompanied with the transfer of electrons from regions of higher Fermi energy to the region of the lower Fermi energy and vice versa for the holes.
3. Redistribution of the charges results in electric field and creation of the potential barriers in the system. These effects are confined only close to interface between the layers. The regions that are far from interface remain as they were before equilibrium state.
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