scholarly journals Coefficient of Interband Light Absorption by InAs/GaхIn1-хAs Quantum Dot Superlattice at Low Temperatures

2017 ◽  
Vol 18 (2) ◽  
pp. 151-157
Author(s):  
V.I. Boichuk ◽  
I.V. Bilynsky ◽  
R.I. Pazyuk
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Absorption Coefficient ◽  
Light Absorption ◽  
Low Temperatures ◽  
Dispersion Relations ◽  
Interband Absorption ◽  
Absorption Bands ◽  
Interband Light Absorption

In the paper the InAs/GaxIn1-xAs superlattice system of small size cubic QDs (10 nm) has been considered. Dispersion relations for electron and hole subbands have been calculated for superlattices of different dimensionality. The dependences of the interband absorption coefficient on light frequency, quantum dot size and interdot distance have been researched.It is shown, that the dimension of the superlattice has influence on the shape of the absorption bands and the increasingof the distance between quantum dots is followed by narrowing of the absorption peaks for all three superlatticetypes.

Photoelectric Effect of Hybrid Ultraviolet-Sensitized Phototransistors from N-type Organic Semiconductor and All-Inorganic Perovskite Quantum Dot Photosensitizer

Nanoscale ◽  
2021 ◽  
Author(s):  
Shao-Huan Hong ◽  
Shakil N. Afraj ◽  
Ping-Yu Huang ◽  
Yi-Zi Yeh ◽  
Shih-Huang Tung ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Organic Semiconductor ◽  
Light Absorption ◽  
Photoelectric Effect ◽  
Strong Light ◽  
Solution Processed ◽  
Inorganic Perovskite ◽  
Perovskite Quantum Dots ◽  
Low Dimensional

Low-dimensional all-inorganic perovskite quantum dots (QDs) have been increasingly developed as photo-sensing materials in the field of photodetectors because of their strong light-absorption capability and broad bandgap tunability. Here, solution-processed...

Transport Properties of Coupled Semiconductor Quantum Dots

2006 ◽  
Vol 6 (11) ◽  
pp. 3329-3332 ◽  
Author(s):  
Heejun Jeong
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Transport Properties ◽  
Electronic Transport ◽  
Low Temperatures ◽  
Spin Interaction ◽  
Many Body ◽  
Conductance Measurement ◽  
Spin Configuration ◽  
Non Linear

We have measured the electronic transport properties of the coupled quantum dot devices at low temperatures. The interplay between the strong many body spin interaction and the molecular states are probed in linear and non-linear transport regime. We observe the formation of strong coherent molecular states clearly visible in the double dot conductance phase diagram. In our study, the spin configuration in multiply coupled quantum dots could be identified using Kondo phenomenon. In addition, the characteristics of the spin dependent molecular states and phase dependant tunneling have been also observed using non-linear conductance measurement of the double dots. The results suggest the importance of the diverse spin related physical issues in artificial quantum dot devices.

scholarly journals Direct Interband Light Absorption in Strongly Prolated Ellipsoidal Quantum Dots’ Ensemble

2008 ◽  
Vol 4 (2) ◽  
pp. 106-112 ◽  
Author(s):  
K. G. Dvoyan ◽  
D. B. Hayrapetyan ◽  
E. M. Kazaryan
Keyword(s):  
Quantum Dots ◽  
Light Absorption ◽  
Interband Light Absorption

Quantum-dot Cellular Automata

2001 ◽  
Vol 696 ◽  
Author(s):  
Gregory L. Snider ◽  
Alexei O. Orlov ◽  
Ravi K. Kummamuru ◽  
Rajagopal Ramasubramaniam ◽  
Islamshah Amlani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cellular Automata ◽  
Quantum Dot ◽  
Low Temperatures ◽  
Tunnel Junctions ◽  
Operating Temperature ◽  
Building Blocks ◽  
Quantum Dot Cellular Automata ◽  
Background Charge ◽  
Metal Islands

AbstractAn overview is given of the quantum-dot cellular automata (QCA) architecture, along with a summary of experimental demonstrations of QCA devices. QCA is a transistorless computation paradigm that can provide a solution to such challenging issues as device and power density. The basic building blocks of the QCA architecture, such as AND, OR gates and clocked cells have been demonstrated and will be presented here. The quantum dots used in the experiments to date are metal islands that are coupled by capacitors and tunnel junctions, and devices operate only at very low temperatures. For QCA to be used in practical devices, the operating temperature must be raised, and issues such as background charge must be addressed. An introduction will be given to these issues and possible solutions.

scholarly journals High-Uniform and High-Efficient Color Conversion Nanoporous GaN-Based Micro-LED Display with Embedded Quantum Dots

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2696
Author(s):  
Yu-Ming Huang ◽  
Jo-Hsiang Chen ◽  
Yu-Hau Liou ◽  
Konthoujam James Singh ◽  
Wei-Cheng Tsai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Absorption ◽  
Full Color ◽  
Led Array ◽  
High Efficient ◽  
New Type ◽  
Conversion Efficiencies ◽  
Color Conversion ◽  
Scatter Light

Quantum dot (QD)-based RGB micro-LED technology is seen as one of the most promising approaches towards full color micro-LED displays. In this work, we present a novel nanoporous GaN (NP-GaN) structure that can scatter light and host QDs, as well as a new type of micro-LED array based on an NP-GaN embedded with QDs. Compared to typical QD films, this structure can significantly enhance the light absorption and stability of QDs. As a result, the green and red QDs exhibited light conversion efficiencies of 90.3% and 96.1% respectively, leading to improvements to the luminous uniformity of the green and red subpixels by 90.7% and 91.2% respectively. This study provides a viable pathway to develop high-uniform and high-efficient color conversion micro-LED displays.

Exciton states and direct interband light absorption in the ensemble of toroidal quantum dots

2017 ◽  
Vol 11 (04) ◽  
pp. 1 ◽  
Author(s):  
Davit A. Baghdasaryan ◽  
David B. Hayrapetyan ◽  
Hayk A. Sarkisyan ◽  
Eduard M. Kazaryan ◽  
Sergey I. Pokutnyi
Keyword(s):  
Quantum Dots ◽  
Light Absorption ◽  
Interband Light Absorption
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