A Pathway to Type-I Band Alignment in Ge/Si Core–Shell Nanowires

2012 ◽  
Vol 4 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Jongseob Kim ◽  
Jung Hoon Lee ◽  
Ki-Ha Hong
Keyword(s):  
Band Alignment ◽  
Core Shell ◽  
Type I ◽  
Shell Nanowires

scholarly journals Type I band alignment in GaAs81Sb19/GaAs core-shell nanowires

2015 ◽  
Vol 107 (11) ◽  
pp. 112102 ◽  
Author(s):  
T. Xu ◽  
M. J. Wei ◽  
P. Capiod ◽  
A. Díaz Álvarez ◽  
X. L. Han ◽  
...  
Keyword(s):  
Band Alignment ◽  
Core Shell ◽  
Type I ◽  
Shell Nanowires

scholarly journals Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core–shell nanowires with enhanced photoelectrochemical performance

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 7159-7173 ◽  
Author(s):  
Jia-Jia Tao ◽  
Hong-Ping Ma ◽  
Kai-Ping Yuan ◽  
Yang Gu ◽  
Jian-Wei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Light Absorption ◽  
Atomic Layer ◽  
Band Alignment ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Tio2 Nanowires ◽  
Layer Deposition ◽  
Shell Nanowires

The excellent PEC activity of TiO2 nanowires with GaOxNy results from the enhanced light absorption, favourable band alignment, and high reducibility.

scholarly journals Multiband model of the valence-band electronic structure in cylindrical GaAs nanowires

2010 ◽  
Vol 64 (3) ◽  
pp. 165-170
Author(s):  
Nemanja Cukaric ◽  
Milan Tadic
Keyword(s):  
Energy Levels ◽  
Outer Radius ◽  
Dispersion Relations ◽  
Core Shell ◽  
Type I ◽  
Free Standing ◽  
Gaas Nanowires ◽  
Multiband Model ◽  
Shell Nanowires

We compute the hole states in the GaAs free-standing nanowires, and in the GaAs/(Al,Ga)As core-shell nanowires of type I-s, which are grown along the [100] direction. The hole states are extracted from the 4-band Luttinger-Kohn Hamiltonian, which explicitly takes into account mixing between the light and heavy holes. The axial aproximation is adopted, which allowed classification of states according to the total angular monentum (fz when expressed in units of the Planck constant). The envelope functions are expanded in Bessel functions of the first kind. The dispersion relations of the subbands E(kz) obtained by the devised method do not resemble parabolas, which is otherwise a feature of the dispersion relations of the conduction subbands. Furthermore, the energy levels of holes whose total orbital momentum is fz=1/2 are shown to cross for a free-standing wire. The low energy fz=1/2 states are found to anticross, but these anticrossings turn into crossings when the ratio of the inner and outer radius of the core-shell wire takes a certain value. The influence of the geometric parameters on the dispersion relations is considered for both free standing and core-shell nanowires.

scholarly journals Epitaxial type-I and type-II InAs-AlAsSb core–shell nanowires on silicon

2021 ◽  
Vol 119 (19) ◽  
pp. 193102
Author(s):  
Fabio del Giudice ◽  
Sergej Fust ◽  
Paul Schmiedeke ◽  
Johannes Pantle ◽  
Markus Döblinger ◽  
...  
Keyword(s):  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Shell Nanowires

Emission Enhancement of SiC/SiO2 Core/Shell Nanowires Induced by the Oxide Shell

2012 ◽  
Vol 717-720 ◽  
pp. 557-560 ◽  
Author(s):  
Filippo Fabbri ◽  
Francesca Rossi ◽  
Giovanni Attolini ◽  
Matteo Bosi ◽  
Giancarlo Salviati ◽  
...  
Keyword(s):  
Band Gap ◽  
Band Edge ◽  
Oxide Shell ◽  
Near Band Edge ◽  
Core Shell ◽  
Type I ◽  
Edge Luminescence ◽  
Sio2 Shell ◽  
Band Edge Luminescence ◽  
Shell Nanowires

In this work we report the enhancement of the 3C-SiC band edge luminescence induced by the SiO2 shell in SiC/SiO2 core/shell nanowires (NWs) system. We demonstrate that the shell enhances the SiC near band edge luminescence and we argue the formation of a type-I quantum well between the SiC core and the SiO2 shell, with the consequent injection of carriers from the larger band-gap shell to the narrower band-gap core.

Quasi-Type II Carrier Distribution in CdSe/CdS Core/Shell Quantum Dots with Type I Band Alignment

2018 ◽  
Vol 122 (22) ◽  
pp. 12038-12046 ◽  
Author(s):  
Li Wang ◽  
Kouhei Nonaka ◽  
Tomoki Okuhata ◽  
Tetsuro Katayama ◽  
Naoto Tamai
Keyword(s):  
Quantum Dots ◽  
Band Alignment ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Carrier Distribution

One-Dimensional TiO2@GaON Core-Shell Nanowires with Controlled Shell Thickness from Atomic Layer Deposition for Stable and Efficient Photoelectrochemical Water Splitting

2019 ◽  
Author(s):  
Jiajia Tao ◽  
Hong-Ping Ma ◽  
Kaiping Yuan ◽  
Yang Gu ◽  
Jianwei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Band Gap ◽  
Water Splitting ◽  
Atomic Layer ◽  
Photoelectrochemical Water Splitting ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Shell Nanowires

<div>As a promising oxygen evolution reaction semiconductor, TiO2 has been extensively investigated for solar photoelectrochemical water splitting. Here, a highly efficient and stable strategy for rationally preparing GaON cocatalysts on TiO2 by atomic layer deposition is demonstrated, which we show significantly enhances the</div><div>photoelectrochemical performance compared to TiO2-based photoanodes. For TiO2@20 nm-GaON core-shell nanowires a photocurrent density up to 1.10 mA cm-2 (1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of TiO2 NWs. Furthermore, the oxygen vacancy formation on GaON as well as the band gap matching with TiO2 not only provides more active sites for water oxidation but also enhances light absorption to promote interfacial charge separation and migration. Density functional theory studies of model systems of GaON-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaON core-shell nanowires provide a deeper understanding and universal strategy for enhancing photoelectrochemical performance of photoanodes now available. </div>

scholarly journals Broadband Meta‐Absorber with Au/Ni Core–Shell Nanowires for Solar Vapor Generator

2021 ◽  
Vol 5 (7) ◽  
pp. 2100185
Author(s):  
Soomin Son ◽  
Jaemin Park ◽  
Sucheol Ju ◽  
Daihong Huh ◽  
Junho Jun ◽  
...  
Keyword(s):  
Core Shell ◽  
Vapor Generator ◽  
Shell Nanowires
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