Sourav Roy

Khulna University of Engineering and Technology | KUET · Department of Mechatronics Engineering

Recently, inorganic metal halide perovskites, APbI3 (A = K, Rb, and Cs), have attracted increased attention in the research community of photovoltaic technology due to their superior stability and exceptional structural, electronic, and optical properties. In this paper, the influence of biaxial compressive and tensile strains (−6% to +6%) on the o...

JCR impact factor 2022

In recent years, semipolar InGaN-based green light-emitting diodes (LEDs) have raised indescribable appeal within solid-state lighting industry as promising alternatives for currently available polar c-plane LEDs due to reduction in efficiency droop and related green gap phenomenon. However, any comparative study in terms of internal quantum effici...

Here, we provide a systematic assessment of biaxial strain effects on the electronic, phonon, and optical properties of monolayer TMDs XTe2 (X = Mo and W) using density functional theory calculations. We observed a large direct bandgap of 1.163 eV and 0.974 eV for MoTe2 and WTe2, which reduces to 1.042 eV and 0.824 eV in the spin-orbit coupling amb...

In recent years, semipolar InGaN-based blue laser diodes (LDs) have raised indescribable appeal within solid-state lighting industry as promising alternatives for currently available polar c-plane LDs due to reduction in internal polarization field and related quantum-confined stark effect. However, any comparative study in terms of energy band gap...

A strategy to improve internal collection efficiency of InGaN MQW solar cell grown on non-basal oriented GaN substrate

In this work, an intermediate band solar cell (IBSC) model consisting of MAPbI3 quantum dots (QD) and MAPbCl3 barrier material is explored analytically with MATLAB. Titanium di-oxide (TiO2) is used as transport layer for electron and Spiro-OMeTAD (2,2',7,7'-tet-rakis(N,N'-di-p-methoxyphenylamine)–9,9' spirobifluorene) is used as transport layer for...

In this paper, a novel microstructure photonic crystal fiber (MC-PCF)-surface plasmon resonance sensor is presented and developed using the finite element method with perfectly matched layer boundary condition. The sensor performance in terms of wavelength sensitivity (WS), amplitude sensitivity (AS), and figure of merit (FoM) is quantitatively exa...

In recent years, semipolar InGaN-based blue laser diodes (LDs) have raised indescribable appeal within solid-state lighting industry as promising alternatives for currently available polar c-plane LDs due to reduction in internal polarization field and related quantum-confined stark effect. However, any comparative study in terms of energy band gap...

In recent years, semipolar InGaN-based green light-emitting diodes (LEDs) have raised indescribable appeal within solid-state lighting industry as promising alternatives for currently available polar c-plane LEDs due to reduction in efficiency droop and related green gap phenomenon. However, any comparative study in terms of internal quantum effici...

In this work, a p-i-n junction type intermediate band solar cell (IBSC) model based on metal halide perovskite nanocrystals, specifically methylammonium lead iodide (MAPbI3) quantum dot (QD) and methylammonium lead bromide (MAPbBr3) barrier is designed analytically for the revolutionary next-generation photovoltaic applications. TiO2 and Spiro-OMeT...

In this work, a p-in junction type intermediate band solar cell (IBSC) model based on metal halide perovskite nanocrystals, specifically methylammonium lead iodide (MAPbI 3) quantum dot (QD) and methylammonium lead bromide (MAPbBr 3) barrier is designed analytically for the revolutionary next-generation photovoltaic applications. TiO 2 and Spiro-OM...

The energy band dispersion profile and their dependence on crystal orientation for III-V zinc-blende compound quantum wells (QW) have earned significant attention in recent years due to reduced band mixing effects emerging from increased energy separation between valence subbands. So QW like InGaAs grown in non-conventional orientation seems to be...

InGaAs/InP near-infrared laser emitting around 2µm is numerically investigated to demonstrate key optoelectronic properties along non-conventional crystal orientations with a view to showing superiority over traditional (100) crystal-oriented growth.

A MoS2-Graphene hybrid layer Based High Performance Refractive Index SPR Sensor is illustrated in this paper. Intended for the enhancement of sensor angular sensitivity (S), signal to noise ratio (SNR), quality factor (QF), first of all, the impact of gold layer thickness is investigated and optimized to 40 nm, after then the MoS2 and graphene coti...

A MoS2-Graphene hybrid layer Based High Performance Refractive Index SPR Sensor is illustrated in this paper. Intended for the enhancement of sensor angular sensitivity (S), signal to noise ratio (SNR), quality factor (QF), first of all, the impact of gold layer thickness is investigated and optimized to 40 nm, after then the MoS2 and graphene coti...

Recently, InGaN grown on semipolar and non-polar orientation has caused special attraction due to reduction in the built-in polarization field and increased confinement of high energy states compared to traditional polar c-plane orientation. However, any widespread-accepted report on output power and frequency response of the InGaN blue laser in no...

Numerical Analysis of Lattice-matched InAlAs/InGaAsP/InGaAs based Triple-junction Solar Cell using MATLAB/Simulink

This paper demonstrates numerical simulation of In0.37Al0.63As/In0.38Ga0.62As0.57P0.43/In0.38Ga0.62As based lattice-matched multijunction solar cell (MJSC) in MATLAB/Simulink under AM-1.5D irradiation by assuming low resistance tunnel junction between subcells. The crucial steps of this simulation are illustrated and simulation outcomes are correla...

A numerical approach is presented to study the crystallographic orientation-dependent performance of 445nm InGaN/GaN quantum well (QW) Blue Laser by solving a six-band k.p Hamiltonian for wurtzite crystal using finite difference method. Euler's rotation technique is used to modify the wave vector and Hamiltonian matrix in conventional (0001) crysta...

Here, the optoelectronic performance of lattice matched InGaAs/InP vertical cavity surface emitting LASER is numerically simulated using MATLAB in (100), (110), (111), (113) and (131) crystal orientation by solving an eight-band k.p Hamiltonian using finite difference scheme including spin-orbit coupling. Tensor plane rotation formulae is applied t...

A numerical approach is presented to study the optical properties of compressively strained [113]-oriented InGaAs/GaAs quantum well (QW) architecture by solving an eight-band k.p Hamiltonian using finite difference method including spin-orbit coupling. Euler's rotation technique is used to modify the wave vector and Hamiltonian matrix in convention...

A novel time-domain fitness function for determining the parameters of an optimum proportional–integral derivative (PID) controller for an automatic voltage regulator (AVR) system using Particle Swarm Optimization (PSO) Algorithm approach is presented. An algorithm of employing proposed approach to minimize the maximum percentage overshoot, the ris...

A new approach with aluminum nitride (AlN) based parasitic strip wideband patch antenna has been introduced for 2.5 and 5.8 GHz wireless applications. The novelty of the proposed design is inherited in reduction of edges of patch which influences antenna performance. The impedance bandwidth of the antenna is 0.28 GHz for the first resonance, wherea...

A numerical approach is presented to calculate crystal orientation-dependent effective mass of heavy hole, light hole and spin-orbit split-off hole of III-V semiconductors (GaAs, InAs, InP, GaSb, and InSb etc.) at Gamma-point by envelope approximation using k.p method. Unitary transformation is used to modify the wave vector and eight-band k.p Hami...

In this manuscript a simple and improved eye movement features detection process is described. As most of human activities involve eyes, eye movement features detection is very important, particularly in ubiquitous computing and smart human computer interfaces. We all are familiar with Eye movement features detection techniques that involves image...

A numerical approach is introduced to study the optical properties of compressively strained InGaAs/GaAs quantum well (QW) architecture for arbitrary crystal orientation by solving an eight-band k.p Hamiltonian using finite difference method including spin-orbit coupling. Euler’s rotation technique is used to modify the wave vector and Hamiltonian...

A numerical approach is introduced to study the optical properties of compressively strained InGaAs/GaAs quantum well (QW) architecture considering the piezoelectric (PZ) effect by solving one dimensional Schrödinger equation using finite difference method. Unitary transformation is used to modify the wave vector and strain matrix in conventional [...