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Light-Emitting GaAs Nanowires on a Flexible Substrate
journal contribution
posted on 2018-06-12, 00:00 authored by João Valente, Tillmann Godde, Yunyan Zhang, David J. Mowbray, Huiyun LiuSemiconductor nanowire-based
devices are among the most promising
structures used to meet the current challenges of electronics, optics
and photonics. Due to their high surface-to-volume ratio and excellent
optical and electrical properties, devices with low power, high efficiency
and high density can be created. This is of major importance for environmental
issues and economic impact. Semiconductor nanowires have been used
to fabricate high performance devices, including detectors, solar
cells and transistors. Here, we demonstrate a technique for transferring
large-area nanowire arrays to flexible substrates while retaining
their excellent quantum efficiency in emission. Starting with a defect-free
self-catalyzed molecular beam epitaxy (MBE) sample grown on a Si substrate,
GaAs core–shell nanowires are embedded in a dielectric, removed
by reactive ion etching and transferred to a plastic substrate. The
original structural and optical properties, including the vertical
orientation, of the nanowires are retained in the final plastic substrate
structure. Nanowire emission is observed for all stages of the fabrication
process, with a higher emission intensity observed for the final transferred
structure, consistent with a reduction in nonradiative recombination
via the modification of surface states. This transfer process could
form the first critical step in the development of flexible nanowire-based
light-emitting devices.
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transfer processplastic substrateemission intensityreactive ion etchingplastic substrate structureperformance devicesFlexible Substrate Semiconductor nanowire-based devicesnanowire arrayscells and transistorsnanowire-based light-emitting devicesfabrication processLight-Emitting GaAs Nanowiresquantum efficiencysurface-to-volume ratiobeam epitaxydefect-free self-catalyzedsurface statesMBEsemiconductor nanowiresSi substrateNanowire emissionnonradiative recombination
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