Physical Model and Numerical Results of Dissociation Kinetics of Hydrogen-Passivated Si/SiO2 Interface Defects

1997 ◽  
Vol 490 ◽  
Author(s):  
G. V. Gadiyak
Keyword(s):  
Thermal Dissociation ◽  
Defect States ◽  
Dissociation Kinetics ◽  
Silicon Dioxide Film ◽  
Passivated Silicon ◽  
Silicon Defects ◽  
Kinetics Of ◽  
And Diffusion ◽  
Different Thickness ◽  
Dioxide Film

ABSTRACTA simple model of thermal dissociation and recovery of hydrogen-passivated silicon defects at the Si/SiO2 interface, such as Pb - centers, during vacuum thermal annealing has been suggested. This model considers reactions of hydrogen with defect states at the Si/SiO2 interface and diffusion of liberated atomic and molecular hydrogen in a silicon dioxide film. An excellent agreement was obtained between the experimental and numerical simulation results for oxides with different thickness (200–1024 Å), grown both (111) and (100) samples and annealed in the temperature range (480–700° C).

Studies of the Microscopic Nature of Cu-Pairs in Silicon

1998 ◽  
Vol 510 ◽  
Author(s):  
A.A. Istratov ◽  
T. Heiser ◽  
H. Hieslmair ◽  
C. Flink ◽  
E.R. Weber
Keyword(s):  
Nearest Neighbor ◽  
Emission Rate ◽  
Thermal Dissociation ◽  
Depletion Region ◽  
Dissociation Kinetics ◽  
Neutral Impurity ◽  
Donor Acceptor ◽  
Singly Charged ◽  
Charged Ions ◽  
Kinetics Of

AbstractStudies of the thermal dissociation kinetics of Cu-pairs in p-type silicon revealed that the dissociation energy of the pairs is 1.02±0.07 eV, which is twice as large as the binding energy of a coulombically bound donor-acceptor pairs formed by singly charged ions placed on nearest neighbor <111> sites. The dependence of the hole emission rate from the center versus electric field in the depletion region was found to be much weaker than predicted by the Pool-Frenkel law. On the other hand, the polarization potential describing emission from a neutral impurity gave a satisfactory fit to the experimental data. It is concluded that the Cu-pair is a donor with either covalent or mixed type of bonding of interstitial and substitutional copper atoms.

scholarly journals Shock wave and modelling study of the dissociation kinetics of C2F5I

2021 ◽  
Vol 23 (7) ◽  
pp. 4394-4403
Author(s):  
C. J. Cobos ◽  
L. Sölter ◽  
E. Tellbach ◽  
J. Troe
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Thermal Dissociation ◽  
Uv Absorption ◽  
Reaction Products ◽  
Dissociation Kinetics ◽  
Kinetics Of ◽  
Modelling Study

The thermal dissociation of C2F5I was studied in shock waves monitoring UV absorption signals from the reactant C2F5I and later formed reaction products such as CF, CF2, and C2F4.

Thermal Dissociation Kinetics of Solid and Liquid Ammonium Nitrate

2001 ◽  
Vol 13 (3) ◽  
pp. 960-966 ◽  
Author(s):  
Sergey Vyazovkin ◽  
Jacalyn S. Clawson ◽  
Charles A. Wight
Keyword(s):  
Ammonium Nitrate ◽  
Thermal Dissociation ◽  
Dissociation Kinetics ◽  
Kinetics Of

Accelerating water dissociation kinetics of Ni3N by tuning interfacial orbital coupling

Nano Research ◽  
2021 ◽  
Author(s):  
Yishang Wu ◽  
Yufang Xie ◽  
Shuwen Niu ◽  
Yipeng Zang ◽  
Jinyan Cai ◽  
...  
Keyword(s):  
Water Dissociation ◽  
Dissociation Kinetics ◽  
Kinetics Of

On the Role of Charged Defect States and Deep Traps in the Photocarrier Drift and Diffusion in a-Si:H

2000 ◽  
Vol 609 ◽  
Author(s):  
Paul Stradins ◽  
Akihisa Matsuda
Keyword(s):  
Particle Number ◽  
Defect States ◽  
Total Electron ◽  
Minority Carrier Diffusion Length ◽  
Continuity Equations ◽  
Effective Mobility ◽  
Almost All ◽  
Charged Defects ◽  
And Diffusion

ABSTRACTThe drift and diffusion in the presence of charged defects and photocarriers trapped in the tail states is re-examined. In continuity equations, diffusive and drift currents are related to free particles while the Poisson equation includes all charges. In order to make use of ambipolar diffusion approximation, the mobilities and diffusion coefficients should be attributed to the total electron and hole populations making them strongly particle-number dependent. Due to the asymmetry of the conduction and valence band tails, almost all trapped electrons reside in negatively charged defects (D−). A simple model of photocarrier traffic via tail and defect states allows to establish the effective mobility values and coefficients in Einstein relations. In a photocarrier grating experiment, grating of D− is counterbalanced by the grating of trapped holes. Nevertheless, electrons remain majority carriers, allowing the measurement of minority carrier diffusion length, but analysis is needed to relate the latter with μτ product.

scholarly journals Biosorption and Diffusion Modeling of Pb(II) by Malt Bagasse

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Klaiani B. Fontana ◽  
Giane Gonçalves Lenzi ◽  
Erica R. L. R. Watanabe ◽  
Ervin Kaminski Lenzi ◽  
Juliana A. M. T. Pietrobelli ◽  
...  
Keyword(s):  
Sorption Process ◽  
Isotherm Models ◽  
Diffusion Modeling ◽  
Biosorption Capacity ◽  
Kinetic And Thermodynamic Parameters ◽  
Pseudo Second Order ◽  
Ph Optimization ◽  
Kinetics Of ◽  
And Diffusion

The removal of Pb(II) from water by biosorption processes onto malt bagasse was investigated and the kinetic and thermodynamic parameters were obtained; additionally a diffusion modeling was proposed. The characterization of malt bagasse was performed by FTIR and SEM/EDS. The experiments were conducted in batch system and an experimental design based response surface methodology was applied for agitation speed and pH optimization. The kinetics of biosorption followed pseudo-second-order model and the temperature of the process affected the biosorption capacity. Isotherm models of Langmuir, Freundlich, and Elovich were applied and the Langmuir model showed better fit and the estimated biosorption capacity was 29.1 mg g−1. The negative values obtained for ΔG° and positive values of ΔH° confirm, respectively, the spontaneous and endothermic nature of the process. The diffusion modeling was performed based on experiments in the absence of agitation to investigate the influence of the biosorbent on the sorption process of Pb(II) ions.

scholarly journals High-resolution view of HIV-1 reverse transcriptase initiation complexes and inhibition by NNRTI drugs

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Betty Ha ◽  
Kevin P. Larsen ◽  
Jingji Zhang ◽  
Ziao Fu ◽  
Elizabeth Montabana ◽  
...  
Keyword(s):  
Reverse Transcriptase ◽  
Viral Entry ◽  
Reverse Transcription ◽  
Molecular Mechanisms ◽  
Dissociation Kinetics ◽  
Structural Mechanism ◽  
Medium Resolution ◽  
Kinetics Of ◽  
Hiv 1

AbstractReverse transcription of the HIV-1 viral RNA genome (vRNA) is an integral step in virus replication. Upon viral entry, HIV-1 reverse transcriptase (RT) initiates from a host tRNALys3 primer bound to the vRNA genome and is the target of key antivirals, such as non-nucleoside reverse transcriptase inhibitors (NNRTIs). Initiation proceeds slowly with discrete pausing events along the vRNA template. Despite prior medium-resolution structural characterization of reverse transcriptase initiation complexes (RTICs), higher-resolution structures of the RTIC are needed to understand the molecular mechanisms that underlie initiation. Here we report cryo-EM structures of the core RTIC, RTIC–nevirapine, and RTIC–efavirenz complexes at 2.8, 3.1, and 2.9 Å, respectively. In combination with biochemical studies, these data suggest a basis for rapid dissociation kinetics of RT from the vRNA–tRNALys3 initiation complex and reveal a specific structural mechanism of nucleic acid conformational stabilization during initiation. Finally, our results show that NNRTIs inhibit the RTIC and exacerbate discrete pausing during early reverse transcription.

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