Modelling of Drift Mobility Experiments on a-Si:H

1999 ◽  
Vol 557 ◽  
Author(s):  
Wen Chao Chen ◽  
Louis-André Hamel ◽  
Mathieu Kemp ◽  
Arthur Yelon
Keyword(s):  
Monte Carlo ◽  
Simple Model ◽  
Reasonable Agreement ◽  
Drift Mobility ◽  
Low Field ◽  
Comparison With Experiment ◽  
Multiple Trapping ◽  
Apparent Inconsistency ◽  
High Fields ◽  
Good Agreement

AbstractWe present recent results of a study of the behavior of electronic carriers in a-Si:H, using the model of multiple trapping (MT) in an exponential density of states. In previous publications, using Monte Carlo simulations, we showed that the standard low field MT model gives reasonable agreement with experiment particularly if the Meyer-Neldel effect is included in the model. We report here on the results of including two other effects. First, we have included a simple model of field assisted detrapping, to take account of the effect of high fields. We obtain very good agreement with the results of measurements on both electrons and holes, from a number of laboratories. In addition, we show here that the validity of an effective temperature approach can be checked easily by comparison with experiment. Second, we have presented a simple model of rapid relaxation of trapped carriers. This model offers the possibility of removing the apparent inconsistency between these measurements, and other experiments.

Effect of Electric Field and Current Injection on the Main Electron Trap in Bulk GaAs

1980 ◽  
Vol 2 ◽  
Author(s):  
S. Makram–Ebeid
Keyword(s):  
Impact Ionization ◽  
Electron Trap ◽  
Hot Electron ◽  
Tunneling Model ◽  
Bulk Gaas ◽  
Low Field ◽  
Assisted Tunneling ◽  
High Fields ◽  
Franck Condon ◽  
Good Agreement

ABSTRACTThe dark capacitive transients related to the main electron trap in bulk and VPE GaAs have been studied in detail. The low temperature low field transients are induced by electrons injected from the metal counter electrode. Both hot electron capture and impact ionization effects are observed. At high fields, a phonon assisted tunneling model accounts for the observations and yields the values of the Franck Condon Shift Sw and the energy w of the phonon coupled to the level. These values are found to be in good agreement with other independent estimates.

MECHANISM AND SIMULATION OF UNIFORM NANOWIRES OF POROUS SILICON GROWTH ON p-Si SUBSTRATE

2006 ◽  
Vol 05 (01) ◽  
pp. 69-90 ◽  
Author(s):  
S. M. HOSSAIN ◽  
J. DAS ◽  
S. K. DUTTA ◽  
H. SAHA
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simple Model ◽  
Porous Silicon ◽  
Simulation Algorithm ◽  
Si Substrate ◽  
Experimental Conditions ◽  
Silicon Growth ◽  
P Type ◽  
Good Agreement

An extension of Beale's and Lehman's model for the formation of porous silicon (PS) layer on p-type substrate is proposed with a view to explain the experimental conditions necessary for obtaining either uniform vertical pores or nonuniform pore branching. A uniformity parameter is defined and correlated with the measured porosity. On the basis of this model, a Monte Carlo simulation algorithm for PS growth has been proposed. The dependence of the porosity, uniformity factor and layer thickness with various formation parameters of PS layer has been studied experimentally. Good agreement between the experimental results and simulation has been found and reported in this paper. Conditions leading to uniform vertical PS growth are predicted from this simple model.

A Theoretical Study of Ingress for Shrouded Rotating Disk Systems With Radial Outflow

1991 ◽  
Vol 113 (1) ◽  
pp. 91-97 ◽  
Author(s):  
J. W. Chew
Keyword(s):  
Mathematical Model ◽  
Simple Model ◽  
Reasonable Agreement ◽  
Theoretical Study ◽  
Rotating Disk ◽  
Empirical Constant ◽  
Integral Methods ◽  
Momentum Integral ◽  
Radial Outflow ◽  
Good Agreement

Sealing of the cavity formed between a stationary disk and a rotating disk under axisymmetric conditions is considered. A mathematical model of the flow in the cavity based on momentum integral methods is described and this is coupled to a simple model of the seal for the case when no ingress occurs. Predictions of the minimum imposed flow required to prevent ingress are obtained and shown to be in reasonable agreement with the data of Bayley and Owen (1970), Owen and Phadke (1980), Phadke (1982), and Phadke and Owen (1983a, 1983b, 1988). With an empirical constant in the model chosen to match these data, predictions for the minimum sealing flow are shown to be in good agreement with the measurements of Graber et al. (1987). The analysis of Phadke’s data also indicates the measurements for small seal clearances must be viewed with caution due to errors in setting the seal clearance. These errors are estimated to be twice the minimum clearance considered. Seal behavior when ingress occurs is also considered and estimates of the amount of ingress are made from the available data.

scholarly journals Application of the new Monte Carlo code AlfaMC to the calibration of alpha-particle sources

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 651-655 ◽  
Author(s):  
Miguel Jurado Vargas ◽  
Alfonso Fernández Timón ◽  
Carlos García Orellana
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simple Model ◽  
Alpha Particle ◽  
Counting Rate ◽  
Simple Procedure ◽  
Monte Carlo Code ◽  
Hyperbolic Behavior ◽  
Efficiency Data ◽  
Good Agreement

Abstract Measurements of α-particle sources require corrections to the counting rate due to scattering and self-absorption in the source and the backing material. In this study, we describe a simple procedure to estimate these corrections using the new Monte Carlo code AlfaMC to consider the effects of scattering and self-absorption conjointly, and so to determine the activity of α emitters. The procedure proposed was applied to 235UO2 sources deposited on highly polished platinum backings. In general, the dependence of the efficiency with source thickness was in good agreement with a simple model considering a linear and a hyperbolic behavior for thin and thick sources, respectively, although significant deviations from this model were found for very thin sources. For these very thin sources, the Monte Carlo simulation revealed to be as a required method in the primary calibration of α-particle sources. The efficiency results obtained by simulation with AlfaMC were in agreement with available efficiency data.

Disorientation of Cs(62P1/2) atoms, induced in collisions with noble gases

1976 ◽  
Vol 54 (7) ◽  
pp. 748-752 ◽  
Author(s):  
B. Niewitecka ◽  
L. Krause
Keyword(s):  
Cross Sections ◽  
Noble Gas ◽  
Zero Magnetic Field ◽  
Zero Field ◽  
Buffer Gas ◽  
Resonance Fluorescence ◽  
Circularly Polarized ◽  
Low Field ◽  
Good Agreement ◽  
Gas Pressures

The disorientation of 62P1/2 cesium atoms, induced in collisions with noble gas atoms in their ground states, was systematically investigated by monitoring the depolarization of cesium resonance fluorescence in relation to noble gas pressures. The Cs atoms, contained together with a buffer gas in a fluorescence cell and located in zero magnetic field, were excited and oriented by irradiation with circularly polarized 8943 Å resonance radiation, and the resonance fluorescence, emitted in an approximately backward direction, was analyzed with respect to circular polarization. The experiments yielded the following disorientation cross sections which have been corrected for the effects of nuclear spin: Cs–He: 4.9 ± 0.7 Å2; Cs–Ne: 2.1 ± 0.3 Å2; Cs–Ar: 5.6 ± 0.8 Å2; Cs–Kr: 5.8 ± 0.9 Å2; Cs–Xe: 6.3 ± 0.9 Å2. The results are in good agreement with most of the available zero-field and low-field data.

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

1998 ◽  
Vol 109 (14) ◽  
pp. 6051-6062 ◽  
Author(s):  
M. T. M. Koper ◽  
A. P. J. Jansen ◽  
R. A. van Santen ◽  
J. J. Lukkien ◽  
P. A. J. Hilbers
Keyword(s):  
Monte Carlo ◽  
Simple Model ◽  
Monte Carlo Simulations ◽  
Co Oxidation

Monte Carlo simulation of folding transitions of simple model proteins using a chain growth algorithm

1992 ◽  
Vol 97 (11) ◽  
pp. 8644-8652 ◽  
Author(s):  
Eamonn M. O’Toole ◽  
Athanassios Z. Panagiotopoulos
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simple Model ◽  
Chain Growth ◽  
A Chain

Solitons propagation dynamics in a saturable PT-symmetric fractional medium

2021 ◽  
Author(s):  
Davood Hajitaghi Tehrani ◽  
Mehdi Solaimani ◽  
Mahboubeh Ghalandari ◽  
Bahman Babayar Razlighi
Keyword(s):  
Monte Carlo ◽  
Numerical Methods ◽  
Physical Properties ◽  
Maximum Intensity ◽  
Step Method ◽  
Saturation Parameter ◽  
Potential Depth ◽  
Fractional System ◽  
Nonlinear Fractional Schrödinger Equation ◽  
Good Agreement

Abstract In the current research, the propagation of solitons in a saturable PT-symmetric fractional system is studied by solving nonlinear fractional Schrödinger equation. Three numerical methods are employed for this purpose, namely Monte Carlo based Euler-Lagrange variational schema, split-step method, and extrapolation approach. The results show good agreement and accuracy. The effect of different parameters such as potential depth, Levy indices, and saturation parameter, on the physical properties of the systems such as maximum intensity and soliton width oscillations are considered.

Optical Vibration and Acceleration Sensor With a Silicon Cantilever

1999 ◽  
Author(s):  
Mitsuteru Kimura ◽  
Katsuhisa Toshima ◽  
Harunobu Satoh
Keyword(s):  
Simple Model ◽  
Optical Fiber ◽  
Resonance Frequency ◽  
Acceleration Sensor ◽  
Frequency Range ◽  
Silicon Cantilever ◽  
All Optical ◽  
New Type ◽  
Good Agreement ◽  
Optical Vibration

Abstract A new type all optical vibration and acceleration sensor using the combination of micromachined Si cantilever and optical fiber is proposed, and its fundamental characteristics are demonstrated. The light emitted from bulb-lens set into the V-groove is reflected at the reflector formed on the Si cantilever and then recoupled into the bulb-lens. Several sensors with different length (0.64–6.0 mm long) of the Si cantilever are fabricated to compare the theoretical resonance frequency fr obtained from the simple model and experimental ones. They had good agreement. From the sensing principle the sensing frequency range of the vibration is suitable below the fr of the Si cantilever of the sensor.

Handling of Collimated Irradiation on a Plane-Parallel Participating Medium

2000 ◽  
Author(s):  
Christian Proulx ◽  
Daniel R. Rousse ◽  
Rodolphe Vaillon ◽  
Jean-François Sacadura
Keyword(s):  
Heat Flux ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Scattering Media ◽  
One Dimensional ◽  
Plane Parallel ◽  
Collimated Beam ◽  
Good Agreement

Abstract This article presents selected results of a study comparing two procedures for the treatment of collimated irradiation impinging on one boundary of a participating one-dimensional plane-parallel medium. These procedures are implemented in a CVFEM used to calculate the radiative heat flux and source. Both isotropically and anisotropically scattering media are considered. The results presented show that both procedures provide results in good agreement with those obtained using a Monte Carlo method, when the collimated beam impinges normally.

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