This material property comes in "direct" and "indirect" types, depending on whether an electron transfers momentum to a crystal lattice when emitting a photon. In opto-electronics, this value plays a critical role in a semiconductor's interactions with photons, determining the frequencies a photo-voltaic cell absorbs or an LED emits. For 10 points, this electronic material property is the differen
This material property comes in "direct" and "indirect" types, depending on whether an electron transfers momentum to a crystal lattice when emitting a photon. In opto-electronics, this value plays a critical role in a semiconductor's interactions with photons, determining the frequencies a photo-voltaic cell absorbs or an LED emits. For 10 points, this electronic material property is the difference between the energy of an electron in a substance's conduction band and its valence band, the size of which determines if a material is a conductor, insulator, or semiconductor.
This material property comes in "direct" and "indirect" types, depending on whether an electron transfers momentum to a crystal lattice when emitting a photon.