An absorption edge is a specific wavelength or energy level at which a material starts to absorb photons, leading to a significant increase in absorption coefficient. It typically occurs in materials such as semiconductors, insulators, and certain elemental or compound materials. The absorption edge is significant in various contexts: 1. **Semiconductors**: In semiconductors, the absorption edge corresponds to the energy gap (bandgap) between the valence band and the conduction band.
New to topics? Read the docs here!