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- W2007309729 abstract "Cubic Al x Ga 1- x N/GaN heterostructures were grown by plasma-assisted molecular beam epitaxy on free-standing 3C-SiC(001). The samples consist of an unintentionally doped 600 nm thick c-GaN buffer and a 30 nm c-Al 0.3 Ga 0.7 N layer. Capacitance–voltage measurements were performed on metal–oxide–semiconductor heterojunction structure using SiO 2 as an insulator. A depth profile of the net donor concentration N CV of the grown sample was measured, demonstrating a clear carrier accumulation at the heterojunction. By electron holography in a transmission electron microscope the potential profile was measured and a free electron concentration of 5.1×10 11 cm -2 was estimated at the c-Al x Ga 1- x N/GaN interface. Using a one-dimensional (1D) Poisson simulator the results of both techniques are compared and a conduction-to-valence band offset ratio of about 4:1 for the cubic Al x Ga 1- x N/GaN interface is estimated, which promotes the electron accumulation. Our results demonstrate that the two-dimensional electron gas (2DEG) in cubic Al x Ga 1- x N/GaN heterostructures can be achieved without the need of polarization effects and is due to the residual background doping in the Al x Ga 1- x N and GaN." @default.
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- W2007309729 date "2013-05-20" @default.
- W2007309729 modified "2023-10-01" @default.
- W2007309729 title "Capacitance Voltage Characteristics and Electron Holography on Cubic AlGaN/GaN Heterojunctions" @default.
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- W2007309729 doi "https://doi.org/10.7567/jjap.52.08jn04" @default.
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