Abstract
A study of the electroluminescence of erbium-doped, amorphous hydrogenated silicon, a-Si:H 〈Er〉, is reported. It has been found that the electroluminescence intensity at the wavelength λ=1.54 µm corresponding to the 4 I 13/2→4 I 15/2 intra-4f shell transition in Er passes through a maximum near room temperature. The unusual temperature and field dependences of the electroluminescence indicate electric-field induced multi-phonon tunneling emission of electrons from deep centers. The electroluminescence of Er3+ ions is due to their becoming excited as conduction-band electrons are captured by neutral dangling bonds (D 0 centers), which form when erbium is incorporated into the amorphous matrix. This Auger process transforms the center from its neutral state, D 0, to a negatively charged state, D −, and the energy released in the capture is transferred by Coulomb interaction into the erbium-ion 4f shell. The steady-state current through the electroluminescent structure is supported by the reverse process of multi-phonon tunneling-electron emission from the D − center to the conduction band. The proposed theoretical model is in a good agreement with experimental data.
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Fiz. Tverd. Tela (St. Petersburg) 41, 210–217 (February 1999)
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Gusev, O.B., Bresler, M.S., Zakharchenya, B.P. et al. Erbium electroluminescence excitation in amorphous hydrogenated silicon under thermally stimulated deep-center tunneling ionization. Phys. Solid State 41, 185–191 (1999). https://doi.org/10.1134/1.1130752
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DOI: https://doi.org/10.1134/1.1130752