3 February 2017 Stimulation of 450, 650 and 850-nm optical emissions from custom designed silicon LED devices by utilizing carrier energy and carrier momentum engineering
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Proceedings Volume 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems; 1003603 (2017) https://doi.org/10.1117/12.2264197
Event: Fourth Conference on Sensors, MEMS and Electro-Optic Systems, 2016, Skukuza, Kruger National Park, South Africa
Abstract
Optical emission probabilities from silicon were analyzed by appropriate modelling, taking the silicon energy band structure, available carrier energy spread, and available carrier momentum spreads that can be realized with typical device design and operating conditions as available in current silicon technologies. The analyses showed that creation of micron-dimensioned conduction channels as made possible by using a RF bipolar fabrication process, appropriate doping and variations in the channel utilizing Boron, Phosphorous and Germanium doping, and using reversed biased junctions to energize specifically electrons, appropriately controlling carrier energy and carrier density, and control over carrier momentum through appropriate impurity scattering technology; particularly, 280nm, 650nm and 850nm emissions can be stimulated. Particularly, using p+nn and p+np+ device designs with appropriate control over carrier energy, carrier type balancing and implementing enhanced impurity scattering in some device regions, show the greatest potential to enhance these emissions. First iteration empirically conducted device realizations results show interesting peaking features and nonuniform high intensity behaviors. Particularly, it was succeeded to increase the emissions at 650nm with about two orders of magnitude. Internal electrical- to- optical conversion efficiencies of up to 10-4 and intensity emissions of up to 200 nW μm2 are derived, with further prospects to increase emissions further. The attained results compare extremely favorable, and in some cases exceeds, results as published by Venter et al, Kuindersma et al and Du Plessis et al using related technologies.
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L. W. Snyman, J-L. Polleux, K. Xu, "Stimulation of 450, 650 and 850-nm optical emissions from custom designed silicon LED devices by utilizing carrier energy and carrier momentum engineering", Proc. SPIE 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems, 1003603 (3 February 2017); doi: 10.1117/12.2264197; https://doi.org/10.1117/12.2264197
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