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• W4361799360 startingPage "2530" @default.
• W4361799360 abstract "With increasing Al mole fraction, n-contact has become an important issue limiting the development of Al-rich AlGaN-based devices. In this work, we have proposed an alternative strategy to optimize the metal/n-AlGaN contact by introducing a heterostructure with a polarization effect and by etching a recess structure through the heterostructure beneath the n-contact metal. Experimentally, we inserted an n-Al0.6Ga0.4N layer into an Al0.5Ga0.5N p-n diode on the n-Al0.5Ga0.5N layer to form a heterostructure, where a high interface electron concentration of 6 × 1018 cm-3 was achieved with the aid of a polarization effect. As a result, a quasi-vertical Al0.5Ga0.5N p-n diode with a ∼1 V reduced forward voltage was demonstrated. Numerical calculations verified that the increased electron concentration beneath the n-metal induced by the polarization effect and recess structure was the main reason for the reduced forward voltage. This strategy could simultaneously decrease the Schottky barrier height as well as provide a better carrier transport channel, enhancing both the thermionic emission and tunneling processes. This investigation provides an alternative approach to obtain a good n-contact, especially for Al-rich AlGaN-based devices, such as diodes and LEDs." @default.
• W4361799360 created "2023-04-05" @default.
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• W4361799360 date "2023-01-01" @default.
• W4361799360 modified "2023-10-15" @default.
• W4361799360 title "Optimizing metal/n-AlGaN contact by recessed AlGaN heterostructure with a polarization effect" @default.
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• W4361799360 doi "https://doi.org/10.1039/d2na00813k" @default.
• W4361799360 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37143800" @default.
• W4361799360 hasPublicationYear "2023" @default.
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