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• W3006553572 endingPage "062301" @default.
• W3006553572 startingPage "062301" @default.
• W3006553572 abstract "Abstract The effects of the quantum well (QW) width, carrier density, and aluminium (Al) concentration in the barrier layers on the optical characteristics of a gallium nitride (GaN)-based QW laser diode are investigated by means of a careful modelling analysis in a wide range of temperatures. The device’s optical gain is calculated by using two different band energy models. The first is based on the simple band-to-band model that accounts for carrier transitions between the first levels of the conduction band and valence band, whereas the second assumes the perturbation theory (k.p model) for considering the valence intersubband transitions and the relative absorption losses in the QW. The results reveal that the optical gain increases with increasing the n-type doping density as well as the Al molar fraction of the Al x Ga 1– x N layers, which originate the GaN compressive-strained QW. In particular, a significant optical gain on the order of 5000 cm –1 is calculated for a QW width of 40 Å at room temperature. In addition, the laser threshold current density is of few tens of A/cm 2 at low temperatures." @default.
• W3006553572 created "2020-02-24" @default.
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• W3006553572 date "2020-06-01" @default.
• W3006553572 modified "2023-09-23" @default.
• W3006553572 title "Modelling and optical response of a compressive-strained AlGaN/GaN quantum well laser diode" @default.
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• W3006553572 doi "https://doi.org/10.1088/1674-4926/41/6/062301" @default.
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