physica status solidi (b) · 1969 · 233 citations · 3 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSemiconductor MaterialsSolid State PhysicsCrystalline MaterialsElectron-phonon InteractionsElectronic Band StructureElectronic Structure Of SolidsOptical Properties Of SemiconductorsOptical Properties Of SolidsBand GapBand Gap EnergyDirect Band GapElectronic Band GapEnergy Band GapIndirect Band GapOptical Absorption SpectraOptical Band Gap
Abstract Optical absorption measurements on thick monocrystalline samples of GaSe 1− x S x show that in these mixed crystals the lowest energy gap is indirect in the complete range 0 ≦ x ≦ 1. These results are contrary to earlier reports which indicate that GaSe is a direct gap semiconductor. In the case of GaS the absorption spectra allow a tentative identification of the phonons involved in the indirect transition.
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C. Hilsum · Electronics and Power · 1964 · 85 citations