scholarly journals Colloidal Quantum Nanostructures: Emerging Materials for Display Applications

2018 ◽  
Vol 57 (16) ◽  
pp. 4274-4295 ◽  
Author(s):  
Yossef E. Panfil ◽  
Meirav Oded ◽  
Uri Banin
Keyword(s):  
Quantum Nanostructures

scholarly journals Temperature Dependence of Carrier Extraction Processes in GaSb/AlGaAs Quantum Nanostructure Intermediate-Band Solar Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 344
Author(s):  
Yasushi Shoji ◽  
Ryo Tamaki ◽  
Yoshitaka Okada
Keyword(s):  
Solar Cells ◽  
Molecular Beam ◽  
Optical Excitation ◽  
Material System ◽  
Intermediate Band ◽  
Temperature Characteristics ◽  
Quantum Nanostructures ◽  
Band Engineering ◽  
Intermediate Band Solar Cells ◽  
Carrier Extraction

From the viewpoint of band engineering, the use of GaSb quantum nanostructures is expected to lead to highly efficient intermediate-band solar cells (IBSCs). In IBSCs, current generation via two-step optical excitations through the intermediate band is the key to the operating principle. This mechanism requires the formation of a strong quantum confinement structure. Therefore, we focused on the material system with GaSb quantum nanostructures embedded in AlGaAs layers. However, studies involving crystal growth of GaSb quantum nanostructures on AlGaAs layers have rarely been reported. In our work, we fabricated GaSb quantum dots (QDs) and quantum rings (QRs) on AlGaAs layers via molecular-beam epitaxy. Using the Stranski–Krastanov growth mode, we demonstrated that lens-shaped GaSb QDs can be fabricated on AlGaAs layers. In addition, atomic force microscopy measurements revealed that GaSb QDs could be changed to QRs under irradiation with an As molecular beam even when they were deposited onto AlGaAs layers. We also investigated the suitability of GaSb/AlGaAs QDSCs and QRSCs for use in IBSCs by evaluating the temperature characteristics of their external quantum efficiency. For the GaSb/AlGaAs material system, the QDSC was found to have slightly better two-step optical excitation temperature characteristics than the QRSC.

Hybrid Perovskite Quantum Nanostructures Synthesized by Electrospray Antisolvent–Solvent Extraction and Intercalation

2015 ◽  
Vol 8 (1) ◽  
pp. 854-861 ◽  
Author(s):  
Rounak Naphade ◽  
Satyawan Nagane ◽  
G. Shiva Shanker ◽  
Rohan Fernandes ◽  
Dushyant Kothari ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Quantum Nanostructures ◽  
Hybrid Perovskite

Self Organized Array of Quantum Nanostructures Via a Strain Induced Morphological Instability

2001 ◽  
Vol 707 ◽  
Author(s):  
David Montiel ◽  
Judith Müller ◽  
Eugenia Corvera Poiré
Keyword(s):  
Stability Analysis ◽  
Linear Stability Analysis ◽  
Morphological Instability ◽  
Heteroepitaxial Growth ◽  
Dominant Mechanism ◽  
Quantum Nanostructures ◽  
Spontaneous Formation ◽  
Self Organized ◽  
Aspect Ratios ◽  
Terrace Width

ABSTRACTMotivated by the work of Li et al. [1], we have studied the strain induced morphological instability at the submonolayer coverage stage of heteroepitaxial growth on a vicinal substrate with regularly spaced steps. We have performed a linear stability analysis and determined for which conditions of coverage a flat front is unstable and for which conditions it is stable. For low coverages the instability will cause the front to break in an array of islands. Assuming that the fastest growing mode of the instability determines t he properties of the array, we make an estimation of the islands sizes and aspect ratios as well as an estimation of the separation length between islands of the array formed when the dominant mechanism for transport of matter is diffusion of particles along the growing front. These estimations are given as functions of the terrace width and coverage. Since these ones are experimentally controllable parameters, our results could be used to tailor the spontaneous formation of quantum nanostructures.

scholarly journals Dielectric Function of a Quantum-Confined Thin Film with a Modified Pöschel–Teller Potential

2018 ◽  
Vol 63 (12) ◽  
pp. 1109 ◽  
Author(s):  
Kh. A. Gasanov ◽  
J. I. Guseinov ◽  
I. I. Abbasov ◽  
F. I. Mamedov ◽  
D. J. Askerov
Keyword(s):  
Dielectric Permittivity ◽  
Electron Gas ◽  
Two Dimensional ◽  
Quantum Nanostructures ◽  
Carrier Scattering ◽  
Scattering Potential ◽  
Quantum Confined ◽  
Charge Carrier Scattering ◽  
First Time ◽  
Analytical Expressions

The spatial and time dispersions of the dielectric permittivity of an electron gas in quasi-two-dimensional quantum nanostructures are studied. The screening of the charge-carrier scattering potential in a quantum-confined film with a modified P¨oschel–Teller potential is considered for the first time. Analytical expressions for the dielectric permittivity are obtained.

scholarly journals Electrical Control of Spin Relaxation Time in Complex Quantum Nanostructures

2014 ◽  
Vol 126 (4A) ◽  
pp. A-20-A-25 ◽  
Author(s):  
M. Kurpas ◽  
B. Kędzierska ◽  
I. Janus-Zygmunt ◽  
M.M. Maśka ◽  
E. Zipper
Keyword(s):  
Relaxation Time ◽  
Spin Relaxation ◽  
Spin Relaxation Time ◽  
Quantum Nanostructures ◽  
Electrical Control
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