Applied Physics Letters · 2006 · 132 citations · 24 references
EngineeringMaterials SciencePhysicsElectronic MaterialsOptoelectronicsSemiconductor MaterialsDopingOptical Properties Of SemiconductorsSemiconductor Device MaterialsSemiconductor PhysicsWide Band Gap SemiconductorsWide-bandgap SemiconductorsAlloy SemiconductorsConductionConduction BandGallium NitrideGallium Nitride (Gan) MaterialsOptical TransitionsValence BandValence Band Structure
We have synthesized GaNxAs1−yPy alloys (x∼0.003−0.01 and y=0–0.4) using nitrogen (N) ion implantation into GaAsP epilayers followed by pulsed laser melting and rapid thermal annealing techniques. As predicted by the band anticrossing model, the incorporation of N splits the conduction band of the GaAs1−yPy substrate, and strong optical transitions from the valence band to the lower (E−) and upper (E+) conduction subbands are observed. The relative strengths of the E− and E+ transition change as the localized N level EN emerges from the conduction band forming narrow intermediate band for y>0.3. The results show that GaNxAs1−x−yPy alloys with y>0.3 is a three band semiconductor alloy with potential applications for high-efficiency intermediate band solar cells.
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Band Anticrossing in GaInNAs Alloys
W. Walukiewicz, Joel W. Ager, E. E. Haller et al. · Physical Review Letters · 1999 · 1.6K citations