Controlled electrostatic focusing of charged aerosol nanoparticles via an electrified mask

Choi, Hyeonho; Kang, Seunghyon; Jung, Wooik; Jung, Yoon-ho; Park, Sei Jin; Kim, Dae Seong; Choi, Mansoo

doi:10.1016/j.jaerosci.2015.05.017

Cited by 19 publications

(10 citation statements)

References 35 publications

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“…Using this SiO 2 pattern, we then applied IAAL [20][21][22][23][24][25][26][27][28][29] with a multi-pin spark discharge method [27,30] to fabricate the 3DM structure arrays as a template for the 3D solar cells, as shown in figure 1(d), followed by the electron-beam sintering process of the 3DM structures to coalesce aggregated nanoparticles for strengthening the 3DM structures [32]. Gaps between the 3DM structure and the SiO 2 pattern were filled by the spin-on-glass coating process to minimize defects that could occur in the nc-Si:H layer deposited on them [13,33,34].…”

Section: Resultsmentioning

confidence: 99%

“…However, 3D plasmonic structures have rarely been investigated due to difficulties in fabrication. Ion-assisted aerosol lithography (IAAL) [20][21][22][23][24][25][26][27][28][29] of metal nanoparticles generated using a multi-pin spark discharge method [27,30] enables the uniform and reproducible 3DM assembly of nanoparticles with nanoscale-resolution controllability over the wafer scale at room temperature and atmospheric pressure. This cost-effective 3DM fabrication method also ensures compatibility with other building block materials and various solar cell fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

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A light-trapping strategy for nanocrystalline silicon thin-film solar cells using three-dimensionally assembled nanoparticle structures

Jang

et al. 2016

Nanotechnology

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We report three-dimensionally assembled nanoparticle structures inducing multiple plasmon resonances for broadband light harvesting in nanocrystalline silicon (nc-Si:H) thin-film solar cells. A three-dimensional multiscale (3DM) assembly of nanoparticles generated using a multi-pin spark discharge method has been accomplished over a large area under atmospheric conditions via ion-assisted aerosol lithography. The multiscale features of the sophisticated 3DM structures exhibit surface plasmon resonances at multiple frequencies, which increase light scattering and absorption efficiency over a wide spectral range from 350-1100 nm. The multiple plasmon resonances, together with the antireflection functionality arising from the conformally deposited top surface of the 3D solar cell, lead to a 22% and an 11% improvement in power conversion efficiency of the nc-Si:H thin-film solar cells compared to flat cells and cells employing nanoparticle clusters, respectively. Finite-difference time-domain simulations were also carried out to confirm that the improved device performance mainly originates from the multiple plasmon resonances generated from three-dimensionally assembled nanoparticle structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A light-trapping strategy for nanocrystalline silicon thin-film solar cells using three-dimensionally assembled nanoparticle structures

Jang

et al. 2016

Nanotechnology

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“…Eventually, the Saffman lift force would be strongly enhanced, leading to the efficient focusing of the aerosol particle. In comparison with the existing active focusing methods, wherein the external force is often perpendicular to the gas flow [ 31 , 32 , 33 ], the external force was herein applied in the reverse direction of the gas flow here and it enhanced the focusing by increasing the Saffman lift force pointing to the channel center, which would reduce the impact loss of the aerosol particle on the side wall. Therefore, studying the lateral migration of aerosol particles under the influence of the reverse external force is of great interest, and might provide a new way to achieve the efficient focusing of aerosol particles at a relatively high gas velocity and in a short channel length.…”

Section: Operating Principle and Physical Modelmentioning

confidence: 99%

“…Based on the electrostatic force, an einzel lens and an electrodynamic screen were used to focus the aerosol nanoparticles [ 28 , 29 ]. Under the effect of the electrostatic force, the aerosol particles with different sizes could be focused in different positions, and particle separation was achieved [ 31 , 32 , 33 ]. In the active method, the direction of the external force is often perpendicular to the gas flow, which would cause the impact loss of the aerosol particles on the side wall [ 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Focusing of Aerosol Particles in the Microchannel under Reverse External Force: A Numerical Simulation Study

2023

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Focusing aerosol particles efficiently is of great significance for high-precision aerosol jet printing and detection of the airborne target. A new method was proposed herein to achieve the efficient focusing of aerosol particles in the microchannel by using a reverse external force. Considering the slip at the interface between the gas and the aerosol particle, a numerical model of the particle movement in the microchannel was established and simulations were conducted on the gas–particle two-phase flow in the microchannel under the effect of the reverse external force. The results showed that a suitable reverse external force in a similar order of magnitude to the Stokes force can dramatically increase the velocity difference between the particle and the gas, which significantly enhances the Saffman lift force exerted on the aerosol particle. Eventually, the aerosol particle can be efficiently focused at the center of the microchannel in a short channel length. In addition, the influence of the channel geometry, the magnitude, and the direction of the external force on the particle focusing was also studied. This work is of great significance for the precise detection of aerosol particles and the design of nozzles for aerosol jet printing.

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“…Instead, plenty of research have been dedicated to understanding the microscopic aspects of the deposition in an electric field, studying the particle-particle interaction and particle-substrate interaction close to the substrate (You and Choi 2007;Krinke et al 2002;Zhuang et al 2000). These studies have used numerical simulations in combination with experimental validation to study and control the deposition, and from this being able to refine the deposition to make elegant nanostructures with high precision (Kim et al 2006;Choi et al 2015;You and Choi 2007;Krinke et al 2001). Although these studies have been essential for generation of fine nanostructures, studying the macroscopic aspects is still crucial for optimization of the aerosol nanoparticle deposition by, for instance, determining what governs the particle deposition distribution and the collection zone.…”

Section: Introductionmentioning

confidence: 99%

Predicting the deposition spot radius and the nanoparticle concentration distribution in an electrostatic precipitator

Preger

Overgaard

Messing

et al. 2020

Aerosol Science and Technology

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Deposition of aerosol nanoparticles using an electrostatic precipitator is widely used in the aerosol community. Despite this, basic knowledge regarding what governs the deposition has been missing. This concerns the prediction of the size of the particle collection zone, but also, perhaps more importantly, prediction of the nanoparticle concentration distribution on the substrate, both of which are necessary to achieve faster and more precise deposition. In this article, we have used COMSOL Multiphysics simulations, experimental depositions, and two analytical models to describe the deposition. Based on that, we propose a simple equation that can be used to predict the size of the deposition spot as well as the particle concentration on the substrate. The equation we derive concludes that the size of the deposition spot only depends on the gas flow rate into the precipitator, and on the constant drift velocity of a particle in an electric field. The equation also displays that the deposited particle concentration is independent of the gas flow rate. Our general mathematical analysis has great applicability, as it can be used to model different geometries and different types of deposition methods than the one described in this article. We can therefore also propose that the drift velocity in this model easily could be replaced by another velocity acting on the particles at other deposition conditions, for instance, the thermophoretic velocity during thermophoretic deposition. This would result in the same dependence as presented in this article. Finally, we demonstrate analytically and through experiment that the particle distribution inside the spot will be homogenous and follows a top hat profile.

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Controlled electrostatic focusing of charged aerosol nanoparticles via an electrified mask

Cited by 19 publications

References 35 publications

A light-trapping strategy for nanocrystalline silicon thin-film solar cells using three-dimensionally assembled nanoparticle structures

A light-trapping strategy for nanocrystalline silicon thin-film solar cells using three-dimensionally assembled nanoparticle structures

Efficient Focusing of Aerosol Particles in the Microchannel under Reverse External Force: A Numerical Simulation Study

Predicting the deposition spot radius and the nanoparticle concentration distribution in an electrostatic precipitator

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