Determination of Polarization‐Fields Across Polytype Interfaces in InAs Nanopillars

Li, Luying; Gan, Zhaofeng; McCartney, Martha R.; Liang, Hanshuang; Yu, Hongbin; Yin, Wan‐Jian; Yan, Yanfa; Gao, Yihua; Wang, Jianbo; Smith, David J.

doi:10.1002/adma.201304021

Cited by 29 publications

(18 citation statements)

References 35 publications

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“…The polarity maintains the same direction across the parallel polytype interfaces within the semiconductor NWs, as has been shown in many cases 7 8 11 . On the other hand, the reversal of polarity across interfaces is also possible in various semiconductors.…”

supporting

confidence: 55%

“…For compound semiconductors, the typical polytype structures include the zincblende (ZB) with cubic stacking in the [111] direction, and wurtzite (WZ) with hexagonal stacking in the [0001] direction. With controlled growth of compound semiconductor nanowires (NWs) with alternating ZB and WZ segments 3 4 , charge redistributions in certain polytype regions would happen due either to band offsets at the polytype interfaces 5 6 , or spontaneous polarization in polytype regions with asymmetric structures 7 8 9 10 .…”

mentioning

confidence: 99%

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Polarity continuation and frustration in ZnSe nanospirals

Jin

et al. 2014

Sci Rep

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ZnSe nanospirals including structures with polarity continuation and polarity frustration are simultaneously observed at atomic resolution. Through careful analysis of polarity within each dumbbell based on aberration-corrected high-angle annular-dark-field imaging, polarity continuation across parallel polytype interfaces as well as the surrounding Z-shape faulted dipoles is verified. Moreover, polarity frustration across regions with different stacking sequence, which would lead to accumulations of boundary interface charges in the triangular-shaped mixed regions with potential optoelectronic applications, is carefully studied.

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confidence: 55%

mentioning

confidence: 99%

Polarity continuation and frustration in ZnSe nanospirals

Jin

et al. 2014

Sci Rep

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“…The phase information is crucial for studying electrostatic and magnetic fields since these fields can cause extra phase shifts to the electron waves passing through the sample. With high spatial resolution and sensitivity to variations in phase shifts, electron holography has been successfully applied to characterization of the potential, electric field, and charge distribution across semiconductor heterostructures …”

Section: Introductionmentioning

confidence: 99%

Electron Holographic Study of Semiconductor Light‐Emitting Diodes

Gao

2017

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Semiconductor light-emitting diodes (LEDs), especially GaN-based heterostructures, are widely used in light illumination. The lack of inversion symmetry of wurtzite crystal structures and the lattice mismatch at heterointerfaces cause large polarization fields with contributions from both spontaneous polarization and piezoelectric polarization, which in turn results in obvious quantum confined stark effect. It is possible to alleviate this effect if the local electrostatic fields and band alignment induced charge redistribution can be quantitatively determined across the heterostructures. In this Concept, the applications of electron holography to investigate semiconductor LEDs are summarized. Following the off-axis electron holography scheme, the GaN-based LED heterostructures including InGaN/GaN-based quantum wells, other GaN-based quantum wells, and other forms of GaN-based LED materials are discussed, focusing on the local potential drops, polarization fields, and charge distributions. Moreover, GaAs-based LED heterostructures are briefly discussed. The in-line electron holography scheme emphasizes the capability of large area strain mapping across LED heterostructures with high spatial resolution and accuracy, which is combined with quantitative electrostatic measurements and other advanced transmission electron microscopy characterizations to provide an overall nanometer scale perspective of LED devices for further improvement in their electric and optical properties.

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“…This causes loss of time and money. Another way of repairing is direct pipe welding or the application of patches [4][5][6]. Pipe welding is used in a variety of engineering applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Repair of small damages in steel pipes with composite patches

Ayaz

Çitil

Şahan

2016

Materialwissenschaft Werkst

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The temperature change, internal pressure and corrosion are main reason of cracks in pipes. Removal of damaged pipes with new ones gives rise to major disruption during operation. This causes loss of time and cost. This study aims to prevent crack propagation and to obtain fast repair in damaged area, at the beginning of the damage. Repair of small cracks in steel pipes using composite patches has been studied in this work. The aim of the study is to repair small cracks less than 8 mm length. For this purpose, holes with 8 mm diameters were drilled in 170 mm long pipes and composite patches with 2, 2.6 and 3.2 mm thickness and 35, 40 and 45 mm overlap lengths with 60, 90 and 120° overlap angles were attached with an adhesive of 0.2 mm thickness. The repaired pipes were subjected to internal pressure until damage occurred. A finite element model was developed and the numerical results were verified based on experiments. The repair of steel pipe with adhesive bonding was successfully achieved under high pressure with composite patches. The results show that the increase in overlap angle results in an increased surface area, and consequently an increase in failure load. Furthermore, the failure load increased with an increase in patch thickness. Additionally, it is seen that the failure load does not change significantly with increasing patch thickness.

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Determination of Polarization‐Fields Across Polytype Interfaces in InAs Nanopillars

Cited by 29 publications

References 35 publications

Polarity continuation and frustration in ZnSe nanospirals

Polarity continuation and frustration in ZnSe nanospirals

Electron Holographic Study of Semiconductor Light‐Emitting Diodes

Repair of small damages in steel pipes with composite patches

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