Article
Chemistry, Physical
Shanshan Ding, Julian A. Steele, Peng Chen, Tongen Lin, Dongxu He, Chengxi Zhang, Xiangqian Fan, Eduardo Solano, Andrew K. Whittaker, Mengmeng Hao, Lianzhou Wang
Summary: This study demonstrates the surface passivation of formamidinium lead iodide quantum dots (QDs) by introducing tailored multifunctional ligands (glycocyamine (GLA)), leading to improved energy band alignment and enhanced device performance. The use of GLA ligands reduces non-radiative recombination loss and promotes favorable charge transport. This results in a record-high power conversion efficiency (PCE) of 15.34% and improved device stability.
ADVANCED ENERGY MATERIALS
(2023)
Article
Multidisciplinary Sciences
Nelson Y. Dzade
Summary: Cu2SrSnS4 (CSTS) is a promising alternative material for photovoltaic applications, with efficient light absorption and ideal electronic and optical properties. Interface band offset engineering can improve charge carrier separation and power conversion efficiencies of CSTS for enhanced solar energy conversion.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Guangjing Hou, Yatao Pan, Lulu Qiao, Xia Ran, Tianfeng Li, Zhen Chi, Pingan Liu, Yulu He, Yanmin Kuang, Lijun Guo
Summary: This study demonstrates the enhanced photoelectric properties of Au nanoclusters (Au NCs) and graphene quantum dots (GQDs) composites. The Au NCs act as electron donors to sensitize the GQDs, resulting in improved light absorption and photoelectric performance. The efficient electron transfer from Au NCs to GQDs quenches the fluorescence of Au NCs and enhances the charge separation. The type-II band alignment of Au NCs and GQDs promotes the electron transfer and enhances the photoelectric current.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Huizi Tang-Wang, Chuan Zhou, Ying Wang, Yingnan Guo, Shufang Wang, Guangsheng Fu, Baolai Liang, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo
Summary: In this study, InAs(Sb)/GaAs self-assembled quantum dots (QDs) with type II band alignment were successfully grown by incorporating Sb into InAs and increasing the beam equivalent pressure ratio. These InAsSb QDs exhibit different characteristics compared to the well-studied type-I InAs QDs in terms of excitation intensity, temperature dependence, and luminescence time dependence. The Sb distribution in the QDs and the wetting layer was also investigated.
Article
Chemistry, Physical
Jian Ni, Jiayi Guan, Minghao Hu, Rufeng Wang, Zhiwei Yang, Jun Li, Shuai Zhang, Sen Li, Juan Li, Hongkun Cai, Jianjun Zhang
Summary: Inorganic CsPbBr3 perovskite solar cells have attracted attention for their low cost and resistance to environmental factors. However, the crystallization mechanism and valence band offset limitations hinder efficiency improvement. By optimizing the crystallization process and using quantum dots for modification, higher efficiencies and stability can be achieved.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Meiying Li, Shuaipu Zang, Yinglin Wang, Jinhuan Li, Jiangang Ma, Xintong Zhang, Yichun Liu
Summary: This study successfully improved the power conversion efficiency of PbS colloidal quantum dot solar cells by preparing a n(+)−n double-layered ZnO electron transport layer.
Article
Chemistry, Multidisciplinary
Shuo Zhang, Cheng Bi, Yimei Tan, Yuning Luo, Yanfei Liu, Jie Cao, Menglu Chen, Qun Hao, Xin Tang
Summary: In this work, multispectral broadband CMOS-compatible imagers with UV-enhanced visible pixels and SWIR pixels were achieved through layer-by-layer direct optical lithography of colloidal quantum dots (CQDs). The imagers showed high-resolution single-color images and merged multispectral images, with low photoresponse nonuniformity (PRNU) and dead pixel rate.
Article
Chemistry, Physical
Rosinildo Fideles do Nascimento, Anielle Christine Almeida Silva, Tasso O. Sales, Artur F. Sonsin, Eduardo Jorge da Silva Fonseca, Samuel T. Souza, Ygor M. de Oliveira, Fabiane C. de Abreu, Noelio Oliveira Dantas
Summary: The study demonstrates that the ratio of CdSe/CdS ultrasmall quantum dots conjugated with reduced graphene oxide significantly affects the properties of the nanocomposites, with a higher proportion of USQDs leading to luminescence quenching and an increase in nonradiative decay rate due to electron transfer processes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Condensed Matter
J. -R. D. Djomou, A. J. Fotue, S. C. Kenfack, L. C. Fai
Summary: By investigating the optical bipolaron properties in a symmetric quantum dot, it was found that energies increase with the coupling constant, and the strong coupling method is more effective when electron-phonon coupling is enhanced. Additionally, the binding energy is always positive when confinement strength is above 5.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Jan Kettler, Nitika Vaish, Laure Mercier de Lepinay, Benjamin Besga, Pierre-Louis de Assis, Olivier Bourgeois, Alexia Auffeves, Maxime Richard, Julien Claudon, Jean-Michel Gerard, Benjamin Pigeau, Olivier Arcizet, Pierre Verlot, Jean-Philippe Poizat
Summary: Hybrid quantum optomechanical systems interface a macroscopic mechanical degree of freedom with a single two-level system, such as a single spin, a superconducting qubit, or a single optical emitter. While progress has been made in the microwave domain, challenges remain in the optical domain in achieving the reciprocal effect of a single quantum system on a macroscopic mechanical resonator.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Ambrish Kumar Srivastava
Summary: The study shows that alkali metal atoms adsorbed on the surface of LiG can significantly reduce the energy gap of M@LiG structure, leading to strong charge transfer, increased dipole moment, and polarizabilities. The lowest-energy M@LiG structures exhibit extremely high static hyperpolarizability values.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Hussein Ghafel AL-Toki, Ramzi Maalej, Boshra Ghanbari Shohany
Summary: In this research, the structural, electronic, and optical properties of ANBN quantum dots (QD) with N=2,3,4 were investigated with and without the presence of Cu impurity atom using density functional theory and Siesta computational code. The results showed that ANBN QD structures exhibit semiconductor behavior, but in the presence of Cu atom, they exhibit semi-metallic behavior. The study also revealed that the transition threshold energy of quantum dots corresponds to their band gap value.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Quanbo Jiang, Prithu Roy, Jean-Benoit Claude, Jerome Wenger
Summary: In this research, plasmonic nanoantennas were used to trap single colloidal quantum dots and enhance their photoluminescence without the need for further processing, achieving precise positioning of the quantum emitter at the nanoantenna hotspot. The dedicated nanoantenna design exhibited high trap stiffness for quantum dot trapping and relatively low trapping power, resulting in significantly improved emission characteristics of the single quantum dot.
Article
Chemistry, Physical
Xing Meng, Yifan Chen, Fan Yang, Jieqi Zhang, Guozheng Shi, Yannan Zhang, Haodong Tang, Wei Chen, Yang Liu, Lin Yuan, Shaojuan Li, Kai Wang, Qi Chen, Zeke Liu, Wanli Ma
Summary: This study explores the potential of using conjugated polymers as hole-transporting layer (HTL) in lead sulfide (PbS) quantum dot solar cells. The precise regulation of the inorganic/organic interface is crucial for achieving high-performance devices. By introducing CsPbl(3) quantum dots as an interfacial layer between the PbS quantum dot active layer and the organic polymer HTL, the interface is mediated and favorable energy level alignment is achieved, resulting in improved charge extraction and reduced interfacial charge recombination. As a result, the photovoltaic performance is efficiently improved from 10.50% to 12.32%. This study may provide new guidelines for the device structural design of quantum dot optoelectronics by integrating different solution-processed semiconductors.
Article
Quantum Science & Technology
Manish Kumar Mehta, Joseph Thomas Andrews, Pratima Sen
Summary: In this paper, a novel method is proposed to overcome the limitations of exciton and biexciton states only appearing at low temperatures, as well as the complexity of using lasers with different polarization states for CNOT operations. By utilizing ultrafast magnetic pulse CNOT gate operation in Mn-doped InSb quantum dots at room temperature, with only a circularly polarized laser pulse, the proposed method shows a significantly large fidelity calculation for CNOT gate.
QUANTUM INFORMATION PROCESSING
(2021)
