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• W2791679997 abstract "As an alternative to light emitting diodes (LEDs) based on thin films, nanowire based LEDs are the focus of recent development efforts in solid state lighting as they offer distinct photonic advantages and enable direct integration on a variety of different substrates. However, for practical nanowire LEDs to be realized, uniform electrical injection must be achieved through large numbers of nanowire LEDs. Here, we investigate the effect of the integration of a III-Nitride polarization engineered tunnel junction (TJ) in nanowire LEDs on Si on both the overall injection efficiency and nanoscale current uniformity. By using conductive atomic force microscopy (cAFM) and current-voltage (IV) analysis, we explore the link between the nanoscale nonuniformities and the ensemble devices which consist of many diodes wired in parallel. Nanometer resolved current maps reveal that the integration of a TJ on n-Si increases the amount of current a single nanowire can pass at a given applied bias by up to an order of magnitude, with the top 10% of wires passing more than ×3.5 the current of nanowires without a TJ. This manifests at the macroscopic level as a reduction in threshold voltage by more than 3 V and an increase in differential conductance as a direct consequence of the integration of the TJ. These results show the utility of cAFM to quantitatively probe the electrical inhomogeneities in as-grown nanowire ensembles without introducing uncertainty due to additional device processing steps, opening the door to more rapid development of nanowire ensemble based photonics." @default.
• W2791679997 created "2018-03-29" @default.
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• W2791679997 date "2018-02-26" @default.
• W2791679997 modified "2023-09-29" @default.
• W2791679997 title "Nanoscale current uniformity and injection efficiency of nanowire light emitting diodes" @default.
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• W2791679997 doi "https://doi.org/10.1063/1.5020734" @default.
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