Core-Shell Nanorods as Ultraviolet Light-Emitting Diodes.

Core-Shell Nanorods as Ultraviolet Light-Emitting Diodes.
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DOI:
10.1021/acs.nanolett.2c04826
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发表时间:
2023-02-22
期刊:
影响因子:
10.8
通讯作者:
Martin, Robert W.
Martin, Robert W.
中科院分区:
材料科学1区
文献类型:
--
作者:
Cameron, Douglas;Coulon, Pierre-Marie;Fairclough, Simon;Kusch, Gunnar;Edwards, Paul R.;Susilo, Norman;Wernicke, Tim;Kneissl, Michael;Oliver, Rachel A.;Shields, Philip A.;Martin, Robert W.

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Existing barriers to efficient deep ultraviolet (UV) light-emitting diodes (LEDs) may be reduced or overcome by moving away from conventional planar growth and toward three-dimensional nanostructuring. Nanorods have the potential for enhanced doping, reduced dislocation densities, improved light extraction efficiency, and quantum wells free from the quantum-confined Stark effect. Here, we demonstrate a hybrid top-down/bottom-up approach to creating highly uniform AlGaN core–shell nanorods on sapphire repeatable on wafer scales. Our GaN-free design avoids self-absorption of the quantum well emission while preserving electrical functionality. The effective junctions formed by doping of both the n-type cores and p-type caps were studied using nanoprobing experiments, where we find low turn-on voltages, strongly rectifying behaviors and significant electron-beam-induced currents. Time-resolved cathodoluminescence measurements find short carrier liftetimes consistent with reduced polarization fields. Our results show nanostructuring to be a promising route to deep-UV-emitting LEDs, achievable using commercially compatible methods.
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