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Unformatted text preview: fference between the top of the valence band and the bottom of the conduction band which is found in insulators and seiconductors. ii), iii) The minimal‐energy state in the conduction band, and the maximal‐ energy state in the valence band, are each characterized by a certain k‐ vector in the Brillouin zone. If the k‐vectors are the same, it is called a “direct gap”. If they are different, it is called an “indirect gap”. b) Direct: GaAs, CdTe, CIGS, CdS, CdSe, InP, ZnS, ZnSs Indirect: Si, Ge, GaP, c) Interactions among electrons, holes, phonons, photons, and other particles are required to satisfy conservation of energy and crystal momentum. A...
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