Category Archive: Papers of Interest

Aug 29

Notes from iPlasmaNano 2018

It was a really dense conference. Mostly, the professors gave talks about the latest updates of their research. The discussions were at high level. I tried to keep my eyes open to follow almost every talk 🙂 But, it’s worth it 🙂 Here are the topics attracting my attention.     Nano particle synthesis: https://scholar.google.com/citations?user=ni1mqkEAAAAJ&hl=en –>in-situ …

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Jul 14

Review: UNIQUE SOLUTIONS TO BOUNDARY VALUE PROBLEMS IN THE COLD PLASMA MODEL

In this article, Otway provides a solution to the closed Dirichlet problem which is a mixed eliptic-hyperbolic equation. This type of equations are encountered in electromagnetic wave propagation in cold plasmas. The equation in the model for electromagnetic wave propagation in zero-temperature plasma is: (x-y^2)u_{xx}+u_{yy}+\kappa u_{x}=0 where u(x,y) is twice-continuously differentiable function. This is a …

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Jul 14

Summary: INTRODUCTION TO GAS DISCHARGES

This article describes plasma sources, the possible movements of particles created inside the plasma, the origins of these particles, the definitions of thermal/non-thermal plasmas, surface and volume interactions, the processes of electrical breakdown, plasma discharge with boundary relations, 0-D model for density, temperature and electric field, and 1-D model for different pressure levels. Thermal velocities …

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Jul 14

Summary: PARTIALLY IONIZED GASES

The article presents introductory materials for the processes inside atoms and between atoms based on energy levels. Firstly, the particles which have a probability to interact with the other species are described. Among the interacting species, photon and electron are elementary particles. The energy of a photon is calculated depending on its frequency. Electron has …

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Jul 14

Summary: ATOMIC COLLISIONS

In this book chapter, particle collisions are examined. Electrons and ions can experience elastic collisions by preserving total momentum and energy. Otherwise, they lose their energy in the form of ionization or excitation and this type is named inelastic collision.  Electrons and fully stripped ions have only kinetic energy but excited and ionized atoms possess …

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Jul 14

Summary: EEDF FOR MODELLING THE PLASMA KINETICS IN DIELECTRIC BARRIER DISCHARGES

In this article, different electron energy distribution functions (EEDF) for plasma conditions in xenon dielectric barrier discharge (DBD) are explored in plasma modelling. At the beginning, ionization and excitation rates resulting from electron-neutral collisions are discussed. Generally, local-field approximation (LFA) is used for those collisions by assuming electrons gain energy in nanoseconds and reaches equilibrium. …

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Jul 14

Summary: MEASUREMENT OF TOWNSEND COEFFICIENT

Sanders investigated the Townsend coefficient (α) in the regions with different pressure and distance levels in his two papers. For the former one, the author criticized the early measurements of Townsend, Bradbury and Paavola to give an explanation to the current values for higher X/p (the ratio of electric field strength [V/cm] to the pressure …

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Jul 14

Summary: PHYSICS OF CATHODE PROCESS

In this chapter, the types of electron emissions from the surface of a metal, which are thermionic emission, field-enhanced thermionic emission, field emission and thermo-field emission, are introduced. While cathode is emitting electrons, anode collects electrons passively and this process simply determines the roles of anode and cathode in gas discharges. The electric current is …

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Jul 14

Summary: SURFACE PROCESSES

In this part, surface adsorption-desorption reactions and secondary electron emission process are explained in detail.  Surface processes have a key role on surface etching, for example. The gas phase on top of the surface interacts with the surface layer. Adsorption-desorption reactions affect gas-phase species concentration. Also, positive ion neutralization and secondary electron emission have effects …

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Jul 14

Summary: THE EFFECTS OF THE FERMI LEVEL ON ION INDUCED ELECTRON EMISSION FROM CHEMICALLY AND SPUTTER CLEANED SEMICONDUCTERS

In the article, low energy ion induced electron emission (IIEE) is investigated on Si and Ge semiconductors. Plasma interactions on semiconductors are recently used for etching and deposition processes. According to the previous studies, the IIEE strongly depends on the surface process but this research focuses on the sub-surfaces processes such as doping type, Fermi …

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