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- W2553589705 abstract "AlxGa1-xN narrow quantum wells (QW) are important elements of deep-ultraviolet light emitting devices. Due to the large exciton binding energy there can be significant exciton effects in photoluminescence (PL) from AlGaN even at room temperature. The exciton binding energy is reduced due to the strong polarization fields in c-plane quantum wells, screening from donor electrons and optically pumped carriers. In this work we model the PL from an AlGaN QW with a partially ionized electron-hole gas in quasi-thermal equilibrium. The predicted radiative decay times are then compared to experimental results. In order to accurately model a partially ionized electron-hole gas at relatively high densities of photo-excited electron-hole carriers and arbitrary temperature, we employed real-time Green’s function formalism with self-energies evaluated in the self-consistent T-matrix approximation [1]. We included one conduction and one top hole band in the perturbation theory formalism. For the device modeled in this work (2.5nm Al0.45Ga0.55N QW with Al0.55Ga0.45N barriers strained to Al0.6Ga0.4N), the top hole band corresponds to the crystal-field split hole band and was approximated by an effective mass in the QWplane and growth direction." @default.
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- W2553589705 date "2013-01-01" @default.
- W2553589705 modified "2023-09-27" @default.
- W2553589705 title "Excitonic Effects in the Photoluminescence of C-Plane Polar AlGaN Quantum Wells" @default.
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