Waveguiding of Photoluminescence in a Layer of Semiconductor Nanoparticles

Ussembayev, Yera; Zawacka, Natalia Klaudia; Strubbe, Filip; Hens, Zeger; Neyts, Kristiaan

doi:10.3390/nano11030683

Cited by 5 publications

(7 citation statements)

References 28 publications

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“…We first use the above method for nanoparticles with relatively low electric fields. We employ an electrostatic calculation − to estimate the amplitude of the electric field in the center of the gap between two ITO electrodes (Methods) as 0.16 MV m –1 for an applied voltage of 20 V (Supplementary Figure S2). For the applied 10 kHz sinusoidal voltage (Figure a), the drift component of the nanoparticle motion is expected to be also sinusoidal (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…The electric field between the ITO electrodes is calculated using the commercially available finite-element solver COMSOL Multiphysics 5.6 (Electrostatics module) according to our previously published methods. − The flow cell with interdigitated electrodes is modeled as a 2D unit cell (Supplementary Figure S2a,b) with a height h and Periodic Boundary Conditions (PBC) applied on the left and right sides of the geometry to simulate an infinite array of electrodes separated by the gap distance d gap . The medium inside the cell is water with a dielectric constant ε m = 80ε 0 .…”

Section: Methodsmentioning

confidence: 99%

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Single Elementary Charge Fluctuations on Nanoparticles in Aqueous Solution

Ussembayev,

Beunis,

Oorlynck

et al. 2023

ACS Nano

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100 years ago, in 1923, the Nobel prize in physics was awarded for measurement of the unit charge. In addition to a profound impact on contemporary physics, this discovery has reshaped our understanding of charge-based interactions in chemistry and biology, ranging from oxidation and ionization to protein folding and metabolism. In a liquid, the discrete nature of the electric charge becomes prominent at the nanoscale when a charge carrier is exchanged between a molecule or a nanoparticle and the surrounding medium. However, our ability to observe the dynamics of such interactions at the level of a single elementary charge is limited due to the abundance of ions in water. Here, we report on the observation of single binding−unbinding events with elementary charge resolution at the surface of a nanoparticle suspended in water. Discrete steps in the electrical charge are revealed by analyzing the motion of optically trapped nanoparticles under the influence of an applied sinusoidal electric field. The measurements are sufficiently fast and long to observe individual (dis)charging events that occur on average every 3 s. Our results offer prospective routes for studying the dynamics of diverse chemical and biological phenomena on the nanoscale with elementary charge resolution.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Single Elementary Charge Fluctuations on Nanoparticles in Aqueous Solution

Ussembayev,

Beunis,

Oorlynck

et al. 2023

ACS Nano

Self Cite

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“…Technology Computing Aided Design (TCAD) software is widely employed in the simulation of semiconductor devices, in addition to analyzing product quality before setting up a production process. Silvaco TCAD, Sentaurus TCAD [ 24 ], Lumerical TCAD [ 25 ], and Comsol Multiphysics [ 26 ] are well-known for modeling solar cells. In this study we are using Sentaurus TCAD to simulate perovskite solar cells.…”

Section: Methodsmentioning

confidence: 99%

Geometric Optimization of Perovskite Solar Cells with Metal Oxide Charge Transport Layers

et al. 2022

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Perovskite solar cells (PSCs) are a promising area of research among different new generations of photovoltaic technologies. Their manufacturing costs make them appealing in the PV industry compared to their alternatives. Although PSCs offer high efficiency in thin layers, they are still in the development phase. Hence, optimizing the thickness of each of their layers is a challenging research area. In this paper, we investigate the effect of the thickness of each layer on the photoelectric parameters of n-ZnO/p-CH3NH3PbI3/p-NiOx solar cell through various simulations. Using the Sol–Gel method, PSC structure can be formed in different thicknesses. Our aim is to identify a functional connection between those thicknesses and the optimum open-circuit voltage and short-circuit current. Simulation results show that the maximum efficiency is obtained using a perovskite layer thickness of 200 nm, an electronic transport layer (ETL) thickness of 60 nm, and a hole transport layer (HTL) thickness of 20 nm. Furthermore, the output power, fill factor, open-circuit voltage, and short-circuit current of this structure are 18.9 mW/cm2, 76.94%, 1.188 V, and 20.677 mA/cm2, respectively. The maximum open-circuit voltage achieved by a solar cell with perovskite, ETL and HTL layer thicknesses of (200 nm, 60 nm, and 60 nm) is 1.2 V. On the other hand, solar cells with the following thicknesses, 800 nm, 80 nm, and 40 nm, and 600 nm, 80 nm, and 80 nm, achieved a maximum short-circuit current density of 21.46 mA/cm2 and a fill factor of 83.35%. As a result, the maximum value of each of the photoelectric parameters is found in structures of different thicknesses. These encouraging results are another step further in the design and manufacturing journey of PSCs as a promising alternative to silicon PV.

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“…Overall, core/shell QDs were more efficient in both absorption and red‐shifted re‐emission than the inverted QD. Ussembayev found that controlling the thickness of the QD film is essential for maximum waveguiding of the re‐emitted light [164] . A thin layer of CdSe/CdS core/shell QDs was dispersed onto a glass substrate, and the thickness was increased by diluting the colloidal QD suspension with toluene.…”

Section: Semiconductor Quantum Dots In Lscsmentioning

confidence: 99%

Review on Colloidal Quantum Dots Luminescent Solar Concentrators

et al. 2021

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Luminescent solar concentrators (LSCs) have recently gained popularity as an effective solution to increase solar energy conversion. Utilizing LSCs together with solar cells can generate more energy at a lower cost than using only solar cells. LSCs operate by utilizing luminophores, molecules that absorb incident solar irradiation and re‐emit photons, and waveguides that redirect emitted photons to the edges of a glass or polymer slab at high concentrations. Many quantum dots (QDs) have been the focus of much research as luminophores for LSCs, owing to their high quantum yields (QYs), controllable absorption/emission spectra, good stability, and ease of synthesis. Various QDs, such as CdSe, PbS, CdS, AgInS2, Si, and C, have been modified to enhance their optical performances in LSCs, often measured by their optical efficiencies, internal/external quantum efficiencies, and power conversion efficiencies. This review appraises the latest developments in colloidal QDs—basic QDs, doped QDs, core/shell QDs, hybrid QDs, and Si‐based QD—for their applications in LSCs. Other factors that enhance an LSC's efficiency, such as altering the polymer matrix and using distributed Bragg reflectors, are discussed. The development of highly efficient, QD‐based LSCs will be essential for increasing solar energy production worldwide.

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Waveguiding of Photoluminescence in a Layer of Semiconductor Nanoparticles

Cited by 5 publications

References 28 publications

Single Elementary Charge Fluctuations on Nanoparticles in Aqueous Solution

Single Elementary Charge Fluctuations on Nanoparticles in Aqueous Solution

Geometric Optimization of Perovskite Solar Cells with Metal Oxide Charge Transport Layers

Review on Colloidal Quantum Dots Luminescent Solar Concentrators

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