High-efficiency asymmetric diffraction based on PT-antisymmetry in quantum dot molecules

2021 ◽  
Author(s):  
Guangling Cheng ◽  
Yongsheng Hu ◽  
Wenxue Zhong ◽  
Aixi Chen
Keyword(s):  
Quantum Dot ◽  
High Efficiency ◽  
Quantum Dot Molecules

InAs and InP Quantum Dot Molecules and their Potentials for Photovoltaic Applications

2006 ◽  
Vol 959 ◽  
Author(s):  
Wipakorn Jevasuwan ◽  
Supachok Thainoi ◽  
Songphol Kanjanachuchai ◽  
Somchai Ratanathammaphan ◽  
Somsak Panyakeow
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
High Efficiency ◽  
Growth Parameters ◽  
Crystal Defects ◽  
Droplet Epitaxy ◽  
Intermediate Band ◽  
Molecular Beam Epitaxial ◽  
Quantum Dot Molecules ◽  
Optical Output

ABSTRACTSelf-assembled InAs and InP quantum dot molecules (QDMs) are grown on GaAs substrates using different molecular beam epitaxial (MBE) growth techniques. The structural and optical properties of the two types of QDMs are then compared and reported. Multi-stack high-density (1012 cm-2) InAs QDMs are grown and when inserted into GaAlAs/GaAs heterostructure results in high-efficiency solar cells. As an alternative to InAs, InP QDMs are grown by droplet epitaxy of In and annealing under P2 pressure. While the number of quantum dots per QDM in the case of InP is in the range of 10 to 12 dots, those in the case of InAs can be smaller or much larger depending on exact growth parameters prior to QD growth. Photoluminescence (PL) measurements show that while InAs QDMs provide room-temperature optical output that peaks at 1.1 eV, InP QDMs have no PL output, possibly due to crystal defects created by low-temperature processing associated with droplet epitaxy. Discussion on the practicality of our QDMs as material for intermediate band solar cells is also provided.

scholarly journals Tailoring the Geometry of Bottom-Up Nanowires: Application to High Efficiency Single Photon Sources

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1201
Author(s):  
Dan Dalacu ◽  
Philip J. Poole ◽  
Robin L. Williams
Keyword(s):  
Quantum Dot ◽  
High Efficiency ◽  
Emission Rate ◽  
Single Photon ◽  
Collection Efficiency ◽  
Photon Emission ◽  
Device Performance ◽  
Bottom Up ◽  
Selective Area ◽  
Photon Generation

For nanowire-based sources of non-classical light, the rate at which photons are generated and the ability to efficiently collect them are determined by the nanowire geometry. Using selective-area vapour-liquid-solid epitaxy, we show how it is possible to control the nanowire geometry and tailor it to optimise device performance. High efficiency single photon generation with negligible multi-photon emission is demonstrated using a quantum dot embedded in a nanowire having a geometry tailored to optimise both collection efficiency and emission rate.

Theoretical study of excitons in GaAs quantum dot molecules obtained by nanoholes filling

2021 ◽  
Vol 124 ◽  
pp. 105614
Author(s):  
S. Tilouche ◽  
A. Sayari ◽  
M. Omri ◽  
S. Souilem ◽  
L. Sfaxi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Theoretical Study ◽  
Quantum Dot Molecules ◽  
Gaas Quantum Dot

Transient spectroscopy of InAs quantum dot molecules

2004 ◽  
Vol 85 (2) ◽  
pp. 284-286 ◽  
Author(s):  
V. G. Talalaev ◽  
J. W. Tomm ◽  
N. D. Zakharov ◽  
P. Werner ◽  
B. V. Novikov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Dot Molecules ◽  
Transient Spectroscopy ◽  
Inas Quantum Dot

ZnO nanorods decorated with metal sulfides as stable and efficient counter-electrode materials for high-efficiency quantum dot-sensitized solar cells

2016 ◽  
Vol 4 (21) ◽  
pp. 8161-8171 ◽  
Author(s):  
Chandu V. V. M. Gopi ◽  
Mallineni Venkata-Haritha ◽  
Young-Seok Lee ◽  
Hee-Je Kim
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Counter Electrode ◽  
Electrode Materials ◽  
High Efficiency ◽  
Zno Nanorods ◽  
Metal Sulfide ◽  
Metal Sulfides ◽  
Sensitized Solar Cells

Metal sulfide decorated with ZnO NRs (ZnO/CoS, ZnO/NiS, ZnO/CuS and ZnO/PbS) were fabricated and used as efficient CEs for QDSSCs.

High efficiency CdS quantum-dot-sensitized solar cells with boron and nitrogen co-doped TiO2 nanofilm as effective photoanode

2015 ◽  
Vol 169 ◽  
pp. 103-108 ◽  
Author(s):  
Ling Li ◽  
Junying Xiao ◽  
Xichuan Yang ◽  
Wenming Zhang ◽  
Huayan Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
High Efficiency ◽  
Doped Tio2 ◽  
Cds Quantum Dot ◽  
Sensitized Solar Cells ◽  
Co Doped

High-Efficiency “Green” Quantum Dot Solar Cells

2014 ◽  
Vol 136 (25) ◽  
pp. 9203-9210 ◽  
Author(s):  
Zhenxiao Pan ◽  
Iván Mora-Seró ◽  
Qing Shen ◽  
Hua Zhang ◽  
Yan Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
High Efficiency ◽  
Quantum Dot Solar Cells
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