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- W2785676585 abstract "In GaN microrods, phase separation of the AlGaN electron-blocking layer is an enormous obstacle for achieving high-efficiency light-emitting diodes, as this phenomenon negatively affects the device efficiency by inducing unwanted band-energy modulations. Here, we found that the AlGaN electron-blocking layer on each m-plane of the GaN microrod appears to be phase separated, and each electron-blocking layer has a different thickness and length. Our careful analysis based on atom probe tomography reveals that the Al distribution in AlGaN is not uniform and that Al-rich and Al-deficient regions are clearly present. In addition, the longer surface diffusion length of Ga adatoms, as compared to Al adatoms, and the different initial strain state of each m-plane in the GaN rods are deeply associated with the different growth rates and inhomogeneous Al composition of AlGaN, resulting in phase separation of the AlGaN electron-blocking layer. These atomic-scale observations in the structural and chemical composition of AlGaN grown on GaN microrods could provide expanded opportunities for building a wide range of high-quality AlGaN electron-blocking layers." @default.
- W2785676585 created "2018-02-23" @default.
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- W2785676585 date "2018-01-31" @default.
- W2785676585 modified "2023-09-26" @default.
- W2785676585 title "Observation of Anisotropic Growth and Compositional Discontinuity in AlGaN Electron-Blocking Layers on GaN Microrods" @default.
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- W2785676585 doi "https://doi.org/10.1021/acs.cgd.7b01554" @default.
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