Infrared Radiation Photodetectors

Nasr, A.

doi:10.5772/34774

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…State‐of‐art detectors have been further miniaturized such that their height is small enough to allow only for a single electronic level in growth direction . Such photodetectors operate already more efficiently due to the lack of an alternative excitation pathway for electrons from this single level despite the low transition dipole moment of this bound‐to‐continuum state transition itself. In QD ICD infrared light is temporarily exciting a conduction band electron in the left QD from

L_{0} \to L_{1}

in an efficient bound‐to‐bound transition followed by the likewise efficient ICD process where an electron current from the second QD is induced .…”

Section: Resultsmentioning

confidence: 99%

Geometrical control of the interatomic coulombic decay process in quantum dots for infrared photodetectors

et al. 2016

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In electron dynamics calculations the interatomic Coulombic decay (ICD) process has recently been shown to take place in two vertically-aligned quantum dots (QDs). Energy emitted during the relaxation of one electron in one QD is converted into kinetic energy of another electron ejected from a neighboring QD.As the electronic structure of QDs can be controlled by their geometries, we prove here in thorough scans of the transversal and vertical QD confinement potentials' widths that geometries are likewise control parameters for ICD. Such a comprehensive investigation has been enabled by a significant development of the calculations in terms of speed achieved among others by optimization of the grid and Coulomb interaction operator representations. As key result of this study we propose two cigarshaped singly-charged GaAs QDs vertically aligned in the direction of their long side for a most efficient QD ICD realization useful for an infrared photodetector. Keywords:Dynamics 1A next-generation quantum dot infrared photodedector is proposed in which radiation absorption and electron emission are localized on either of two vertically-aligned singly-charged GaAs quantum dots among which an efficient energy transfer process, the interatomic Coulombic decay, is operative. Speed-optimized highly-accurate electron dynamics calculations on numerous architectures reveal how the performance may be custom-made through tuning the quantum dots' geometries.2

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L_{0} \to L_{1}

in an efficient bound‐to‐bound transition followed by the likewise efficient ICD process where an electron current from the second QD is induced .…”

Section: Resultsmentioning

confidence: 99%

Geometrical control of the interatomic coulombic decay process in quantum dots for infrared photodetectors

et al. 2016

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“…The infrared camera senses the exiting thermal energy of a body and displays thermal images. The surface temperature profile is then determined as the intensity of the IR energy is directly related to the temperature of the surface [4]. This technique has many applications.…”

Section: Introductionmentioning

confidence: 99%

“…Infrared waves, though starting from just about a micron, spread to almost several millimeters in wavelength. Therefore, infrared radiation refers to a wide band in the electromagnetic spectrum of radiant energy [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Simulation for Prediction of Infrared Radiation Emitted from Plain Surfaces with Different Geometries

Vakilabadi

Moayeri

Ghassemi

2017

International Journal of Applied Mechanics and Engineering

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In this paper, infrared radiation exiting plain surfaces with different geometries is numerically simulated. Surfaces under consideration are assumed to have steady uniform heat generation inside. Moreover, the boundaries of the surfaces are considered to be at the surroundings temperature. Infrared radiation is calculated based on the temperature profile determined for the surface. The temperature profile of the surface is determined assuming the two dimensional heat conduction equations to govern the problem. The physical domain is transformed into the appropriate computational domain and the governing equation is mapped into the suitable forms in the new coordinate system of variables. After that the temperature profile of the surface is computed, the infrared radiation distribution of the surface is evaluated based on the equations given in the manuscript. The temperature profile as well as the IR images are given in the results section. It is concluded that the maximum value of infrared radiation of the surface occurs at the center. Moreover, it is concluded that among surfaces with equal areas, the one having the largest perimeter has the least value of IR at its center.

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Theoretical Model for Observation of the Conversion Efficiency into Quantum Dot Solar Cells

Nasr¹

2016

J. Energy Eng.

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Infrared Radiation Photodetectors

Cited by 3 publications

References 49 publications

Geometrical control of the interatomic coulombic decay process in quantum dots for infrared photodetectors

Geometrical control of the interatomic coulombic decay process in quantum dots for infrared photodetectors

A Numerical Simulation for Prediction of Infrared Radiation Emitted from Plain Surfaces with Different Geometries

Theoretical Model for Observation of the Conversion Efficiency into Quantum Dot Solar Cells

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