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.
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