Photo-luminescence study of superlattice photocathode

Matsuyama, Tomohiro; Mukai, Masayasu; Horinaka, Hiromichi; Wada, Kenji; Nakanishi, Toru; Okumi, Shoji; Togawa, Kazuaki; Baba, Takanobu

doi:10.1063/1.1384228

Cited by 3 publications

(3 citation statements)

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“…3a) at conditions relatively distant from predictions by Paschen's law, where successive drops of Coulomb force are detected at increasing voltages so that it does not indicate intersections with the first half of the Paschen curve. Discharge in contact electrification at similar conditions on the left of the Paschen curve has been reported 7 , as postprocessed in a separate work 32 . This is hypothetically attributed to the increased significance of neutral particles being sputtered or evaporated [33][34][35][36] from the charged surfaces and participating in the avalanches of ionizations, since an increased gap distance at a pseudo-constant (reduced) electric field promotes the population of high-energy impinging electrons or cations, while the observation that each successive minor discharge event happens at a higher voltage may again be attributed to the increased diffusion of such neutral particles into the surroundings at larger gap distances.…”

Section: Resultsmentioning

confidence: 78%

Measuring gas discharge in contact electrification

Tao¹,

Gibert

2023

Preprint

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Contact electrification in a gas medium is usually followed by partial surface charge dissipation caused by gas breakdown triggered during separation. It is widely assumed that such discharge obeys the classical Paschen’s law, which describes the general dependence of breakdown voltage on the product of gas pressure and gap distance. However, quantification of this relationship in contact electrification involving insulators is impeded by challenges in nondestructive in situ measurement of the gap voltage. The present work proposes and implements an electrode-free strategy for capturing discrete discharge events by monitoring the gap voltage via Coulomb force, providing experimental evidence for a Paschen-type behavior for nitrogen breakdown between a silicone-acrylic contact pair. The method offers an alternative approach for characterizing either the ionization energies of gases or the secondary-electron-emission properties of surfaces without the requirement of an external voltage source, which can potentially benefit applications ranging from the design of insulative materials to the development of triboelectric sensors and generators.

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Section: Resultsmentioning

confidence: 78%

Measuring gas discharge in contact electrification

Tao¹,

Gibert

2023

Preprint

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“…This value represents approximately 1%–2% of the maximum charge, also called equilibrium or saturation charge, a particle of the considered size can hold, following the summary of Matsuyama. [ 48 ] The charge was chosen at that low level to investigate its influence on the powder flow. By doing so, they remain airborne.…”

Section: Numerical Set‐up and Simulation Conditionsmentioning

confidence: 99%

Influence of weak electrostatic charges and secondary flows on pneumatic powder transport

Großhans

2023

Can J Chem Eng

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The dynamics of the transported powder determines the functionality and safety of pneumatic conveying systems. The relation between the carrier gas flow, induced by the flown-through geometry, and the powder flow pattern is not clear yet for electrostatically charged particles. This paper highlights the influence of relatively minor cross-sectional secondary flows and electrostatic forces on the concentration and dynamics of the particles. To this end, direct numerical simulations (DNS) capture the interaction of the continuous and dispersed phases using a four-way coupled Eulerian-Lagrangian strategy. The transport of weakly charged particles in channel flows, where turbopheresis defines the particle concentration, is compared to duct flows, where additional cross-sectional vortices form. For both geometries, the Stokes number (St ¼ 8, 32) and the electrical Stokes number (St el ¼ 0, 1, 2, 4 ½ Â10 À3 ) are varied, and the turbulent carrier flow was fixed to Re τ ¼ 360. The presented simulations demonstrate that secondary flows, for the same Re τ , St, and St el , dampen the effect of particle charge. In a duct flow, vortical secondary flows enhance the cross-sectional particle mobility against the direction of electrostatic forces.Compared to a duct flow, in a channel, the wall-normal aerodynamic forces are weaker. Thus, electrical forces dominate their transport; the local particle concentration at the walls increases. Further, electrostatic charges cause a stronger correlation between the gas and particle velocities. In conclusion, despite being weak compared to the primary flow forces, secondary flow and electrostatic forces drive particle dynamics during pneumatic transport.

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“…Materials Research is essential staying the band gap about 2.0 eV 22,23 . Moreover, numerous experimental and computational studies on the optoelectronics properties of Cs 2 InAgCl 6 have been studied to disclose the correctness of its photovoltaic applications 21,24 .…”

Section: Ali Et Almentioning

confidence: 99%

Investigation of Structural, Electronic and Optical Properties of Na2InAgCl6, K2InAgCl6, and Rb2InAgCl6 Lead-Free Halide Double Perovskites Regarding with Cs2InAgCl6 Perovskites Cell and a Comparative Study by DFT Functionals

et al. 2021

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Electronics band structures, the total density of state, the partial density of state and optical properties were investigated by DFT method for A 2 InAgCl 6 (A= Cs, Na, K, and Rb). Moreover, the band gap of Na 2 InAgCl 6 , K 2 InAgCl 6 , Rb 2 InAgCl 6 and Cs 2 InAgCl 6 were calculated at 1.039 eV, 1.041 eV, 1.039 eV and 1.089 eV by GGA with PBE, 0.784 eV, 0.769 eV, 0.775 eV and 0.770 eV by LDA with CA-PZ and 1.310 eV, 1.152 eV, 1.180 eV and 1.169 eV by GGA with RPBE functionals. The density of states (DOS) and partial density of states (PDOS) were evaluated. Among of used functionals, GGA with RPBE functional has considered the appropriate and acceptable method for calculation of band gap where the 1.310 eV of band gap was reported for Cs 2 InAgCl 6 , which is close to experimental value at 1.370 eV. The crystal, Na 2 InAgCl 6 , has considered as the best perovskites cell among other four due to low band gap, and the main cause is revealed that it has attached the lightest Na atom to convey the low band gap as lower surface or atomic size atom.

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Photo-luminescence study of superlattice photocathode

Cited by 3 publications

References 0 publications

Measuring gas discharge in contact electrification

Measuring gas discharge in contact electrification

Influence of weak electrostatic charges and secondary flows on pneumatic powder transport

Investigation of Structural, Electronic and Optical Properties of Na2InAgCl6, K2InAgCl6, and Rb2InAgCl6 Lead-Free Halide Double Perovskites Regarding with Cs2InAgCl6 Perovskites Cell and a Comparative Study by DFT Functionals

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