Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires

Q. Zhu; E. Pelucchi; S. Dalessi; K. Leiter; M. A. Dupertuis; E. Kapon

doi:10.1021/nl060066d

Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires

Q. Zhu
, E. Pelucchi
, S. Dalessi
, K. Leiter
, M. A. Dupertuis
, E. Kapon

Research output: Contribution to journal › Article › peer-review

Abstract

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 (∼100 K) where carrier mobility is enhanced. These wires offer new possibilities for tailoring the confinement potential in one-dimensional systems.

Original language	English
Pages (from-to)	1036-1041
Number of pages	6
Journal	Nano Letters
Volume	6
Issue number	5
DOIs	https://doi.org/10.1021/nl060066d
Publication status	Published - May 2006
Externally published	Yes

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title = "Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires",

abstract = "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 (∼100 K) where carrier mobility is enhanced. These wires offer new possibilities for tailoring the confinement potential in one-dimensional systems.",

author = "Q. Zhu and E. Pelucchi and S. Dalessi and K. Leiter and Dupertuis, \{M. A.\} and E. Kapon",

year = "2006",

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language = "English",

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TY - JOUR

T1 - Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires

AU - Zhu, Q.

AU - Pelucchi, E.

AU - Dalessi, S.

AU - Leiter, K.

AU - Dupertuis, M. A.

AU - Kapon, E.

PY - 2006/5

Y1 - 2006/5

N2 - 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 (∼100 K) where carrier mobility is enhanced. These wires offer new possibilities for tailoring the confinement potential in one-dimensional systems.

AB - 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 (∼100 K) where carrier mobility is enhanced. These wires offer new possibilities for tailoring the confinement potential in one-dimensional systems.

UR - https://www.scopus.com/pages/publications/33744926160

U2 - 10.1021/nl060066d

DO - 10.1021/nl060066d

M3 - Article

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SN - 1530-6984

VL - 6

SP - 1036

EP - 1041

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

Alloy segregation, quantum confinement, and carrier capture in self-ordered pyramidal quantum wires

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