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Alloy segregation, ...
Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires
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- Zhu, Qing (författare)
- Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland
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- Pelucchi, E. (författare)
- Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland
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- Dalessi, S. (författare)
- Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland
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- Leifer, Klaus (författare)
- Uppsala universitet,Experimentell fysik,Elektronmikroskopi och Nanoteknologi
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- Dupertius, Marc-Andre (författare)
- Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland
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- Kapon, E. (författare)
- Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland
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(creator_code:org_t)
- 2006-04-04
- 2006
- Engelska.
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Ingår i: Nano Letters. - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 6:5, s. 1036-1041
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- The structure and photoluminescence (PL) characteristics of AlGaAs quantum wires self-formed by metallorganic vapor-phase epitaxy in inverted tetrahedral pyramids are reported. Capillarity-driven Ga-Al segregation yields vertical quantum wires (VQWRs) at the center of the pyramid, connected to more-weakly segregated vertical quantum wells (VQWs) formed along their wedges. The segregation is evidenced in transmission electron microscope images and in the PL spectra of these structures. Transitions between quantum-confined electron and hole states in the VQWR are identified in the micro-PL spectra with energies in good agreement with model calculations. The temperature dependence of the micro-PL spectra clearly reveals efficient carrier capture into the VQWR from the VQWs, particularly at an intermediate temperature range ( [similar to] 100 K) where carrier mobility is enhanced. These wires offer new possibilities for tailoring the confinement potential in one-dimensional systems.
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