Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 57 for “"Drift Diffusion"”.
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Drift Diffusion Analyses Of Preferential Choice
… problems. The models we propose are based on the drift diffusion model (DDM), which is a benchmark sequential sampling model for studying binary choice problems, is biologically plausible, and has a clear interpretation regarding optimal decision making. Chapter 1 focuses on automatic biases in …
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Generalized drift-diffusion for microscopic thermoelectricity
… lasers are often described with the drift-diffusion equations. We present a microscopic description of the thermoelectric effects using a generalization of the common drift-diffusion formulation of semi-classical transport. We then replicate these basic results in a commerical device …
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Drift-diffusion of a vacancy in inhomogeneous media and its material constants : a Fokker-Planck equation approach with an application to foreign exchange data
This study derived the mobility and diffusion coefficients of a Fokker-Planck equation describing a vacancy hopping in inhomogeneous media in one dimension under a directed stress. The study used the general master equation as a basis for a physical model because of the mesoscopic view that the …
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Distinguishing Medial Temporal Lobe and Prefrontal Cortex Contributions to Approach-Avoidance Conflict in Healthy Controls and Generalized Anxiety Disorder: Insights from Functional Magnetic Resonance Imaging and the Hierarchical Drift Diffusion Model
… Chapter 2, therefore, I applied the Hierarchical Drift Diffusion Model (HDDM), a computational modelling approach, to an AA conflict task administered to healthy controls. I found that PFC regions contributed to inhibition and adjusting response caution, with differential involvement of the …
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Numerical models for the simulation of nonstationary effects in submicron semiconductor devices
… Equation (BTE) is investigated. Augmented drift-diffusion (ADD) models and improved energy transport (ET) models for submicron device simulation are constructed and numerically implemented. Analytical derivation of the length coefficient for the ADD models is presented for both single- and …
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Physics and simulation of transport processes in hybrid organic semiconductor devices
… on single molecules or nanocrystals; the drift-diffusion equations, which describe carrier transport in delocalized states near thermal equilibrium, are no longer valid. A computational model for device operation would give researchers a powerful tool to design and improve devices. This …
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Polymer translocation: a nonequilibrium process
… two different Péclet values (that quantify the drift-diffusion balance of the system). By measuring the average conformation of the polymer and the average duration of each stage, simulations of the capture process reveal an elongated polymer approaching the nanopore and either remains elongated …
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Modeling and Simulation of III-Nitride-Based Solar Cells using Nextnano®
… from both PC1D and Nextnano3, the fundamental drift-diffusion equations were used to calculate the performance of a simple p-n homojunction solar cell device analytically. Silicon was picked as the material for this comparison between the outputs of the two simulators as well as the results of …
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The self-consistent simulation of carrier transport and its effect on the modulation response in semiconductor quantum well lasers
… in bulk regions of the device is modeled with drift-diffusion theory, and carrier fluxes at abrupt heterojunctions are treated with ballistic transport derived from thermionic emission theory. In addition, the first treatment of carrier capture in a quantum well laser simulator is presented, …
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Full band ensemble Monte Carlo simulation of silicon devices
… of more traditional simulators such as drift-diffusion based models, hydrodynamic and energy balance based models, and nonparabolic band approximation Monte Carlo models. A conventional metal-oxide-semiconductor field effect transistor (MOSFET) is simulated as a test case to validate the …
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One-dimensional simulation of vertical-cavity surface-emitting lasers including energy transport
… has been developed. The model incorporates drift-diffusion with carrier-capture and thermionic emission in the quantum regions. Microcavity effects on the stimulated and spontaneous emission are carefully included via the enhancement of the vacuum and radiating electromagnetic fields in a …
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Modelli di rumore di dispositivi elettronici a semiconduttore
… per il caso del modello di trasporto drift-diffusion, nell'ambito del simulatore "general purpose" PADRE degli AT&T Bell Laboratories di Murray Hill, New Jersey, che è in grado di analizzare le caratteristiche elettriche di un generico dispositivo a omo- e eterostruttura avente un …
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Two-Dimensional Modelling of Novel Back-Contact Solar cells
… for reducing the complexity of two-dimensional drift-diffusion simulations are investigated for a back-contact perovskite cell. Analytic expressions for the relationship in both the low extraction velocity and high extraction velocity regimes are demonstrated, and the conditions where these …
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Study of Biological Ion Channels by Using PNP/ECP Model
… (PNP) theory, also known as drift-diffusion theory, can be used to compute macroscopic current in ion channels reasonably quickly. However, PNP theory can be problematic when applied to regions of constricted volume, such as the interior of ion channels. Additionally, …
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Dynamics of human decision-making : vestibular perception and neural correlates
… detection theory and sequential analyses (i.e., drift diffusion model). Specifically, in order to capture the end-point statistics of binary choice and confidence, we built on a previous study that defined choice confidence in terms of psychophysics derived from signal detection theory. At the …
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DNA translocation through an array of kinked nanopores
… ssDNA over dsDNA. We show that a coarse-grained drift-diffusion theory with a sawtooth like potential can reasonably describe the velocity and translocation time of DNA through the pore. By control of pore size, length, and shape, we capture the major functional behaviors of protein pores in our …
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The Effect of Polarization and InGaN Quantum Well Shape in Multiple Quantum Well Light Emitting Diode Heterostructures
… emitting diodes (LEDs) employing semi-classical drift-diffusion models has used reduced polarization constants without much physical explanantion. This paper investigates possible physical explanations for this effective polarization reduction in InGaN LEDs through the use of the simulation …
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Device physics of perovskite light-emitting diodes
… an archetypical device structure and employ drift-diffusion modelling to explore the working principles and unique device physics of PeLEDs.
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Anisotropic variational models and PDEs for inverse imaging problems
… data. Secondly, we focus on a non-symmetric drift-diffusion equation, called osmosis. We propose an efficient numerical implementation of the osmosis equation, based on alternate directions and operator splitting techniques. We study their scale-space properties and show their efficiency in …
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Two-dimensional simulation of quantum well lasers including energy transport
… patterns. The simulator is based on the drift-diffusion model with full Fermi-Dirac statistics for the transport equations as well as for the Poisson equation. Simulation of the thermionic emission current is required at the abrupt hetero-interfaces of the quantum well. Energy transfer …
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