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Electronic band structure of GaN diluted and overdiluted with group-V elements
Phys. Rev. Applied 23, 024005 – Published 3 February, 2025
DOI: https://doi.org/10.1103/PhysRevApplied.23.024005
Abstract
The technology for manufacturing -based devices is already very mature, but band engineering in this technology is still limited to mixing group-III elements, while the incorporation of group-V elements into can create possibilities in band-gap engineering. In this work, we report comprehensive experimental studies of the electronic band structure for -diluted and overdiluted supported by computational methods based on the state-of-the-art density-functional-theory (DFT) approach. These studies clearly demonstrated that the incorporation of arsenic into modifies the valence band, while the conduction band remains undisturbed up to 8% arsenic content. For the first time, -related changes in the valence band are studied with high resolution in electron photoemission spectroscopy. -related narrowing of the energy gap is also detected in the absorption spectra. These experimental observations are very consistent with the calculations of the electronic band structure for , and therefore the same DFT approach was used to calculate the electronic band structure for diluted and overdiluted with the remaining group-V elements, i.e., , , and . In this case, it is also clearly visible that adding , , or to modifies the valence band, while the conduction band remains undisturbed when the V-group concentration does not exceed 5%.
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