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A quantum mechanical approach of first order born approximation is taken to numerically model AlGaAs/GaAs Quantum Well Infrared detector that operates at long wavelength region (8–9µm). Our numerical analysis of the photocurrent spectra as well as the broadening of the same at 8.31µm peak wavelength is found to be in close resemblance with the experimental result with 8.55µm peak wavelength as reported...
We report a quantum mechanical analysis of photocurrent response and its inhomogeneous broadening in a GaAs/InGaAs/InAs Quantum-Dot-in-a-Well Infrared Photo detector studied and modeled by Green's Function Formalism. Factors that typically contribute to spectral broadening, namely quantum dot geometric dimension variance, and irregular inter-diffusion of Gallium atom from quantum well to binary Incas...
In this work, a two dimensional (2-D) analytical model and simulation of dual material gate (DMG) Al0.7Ga0.3Sb/InAs High Electron Mobility Transistor (HEMT) has been presented. Superiority of DMG over single material gate (SMG) structure for this kind of HEMTs has been highlighted. Simulation results show the suppression of short channel effects (SCEs) and improvement of carrier transport efficiency...
The efficiency of the avalanche process in Avalanche photodiodes depends on the Ionization coefficients. Ionization coefficients are dependent on the band-structure of materials. Ionization coefficients at different temperatures and fields are predicted by an analytical formula proposed by Okuto and Crowell. In this work, we propose two different mean free paths in two different field regions. These...
In recent times, the Type-II InAs/GaSb Superlatttice has been opted as a viable replacement for HgCdTe based photodetectors as the band structure of these devices can be tailored. Significant progress has been made and ongoing research is being conducted in the growth and characterization of these devices. We present the model of such a device with experimentally verified dimensions and parameters...
Bangladesh, not being bestowed with fossil fuels is compelled to rely on renewable energy sources. Despite having potentiality as sustainable energy sources, due to the lack of proper planning, biogas and biomass contribution to master plan by Bangladesh government of having 5% of total generation from renewable energy sources will be insufficient. Even IDCOL, the leading contributor in this field...
The absorption co-efficient of symmetric conical shaped InAs/InGaAs quantum dots-in-a-well (DWELL) infrared photo-detector has been calculated through Non-Equilibrium Green's Function (NEGF) approach to explain their relative magnitude resulting from various quantum dot dimensions. Kinetic equation of Green's function is solved by using method of finite difference and wave-function is calculated from...
Local Density of State (LDOS) and hence Density of State (DOS) at different energy levels of asymmetric conical shaped InAs/InGaAs quantum dots-in-a-well (DWELL) infrared photo-detector has been calculated through Non-Equilibrium Green's Function (NEGF) approach to explain the tri-band operation. Method of finite difference is used to solve the kinetic equation of Green's function and Self-energy...
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