ORCID Profile
0000-0002-2150-6487
Current Organisation
Rajshahi University of Engineering and Technology
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Publisher: AIP Publishing
Date: 06-2022
DOI: 10.1063/5.0086386
Abstract: In this paper, we have investigated the nonlinear optical response and theoretical efficiency of CH3NH3PbI3−xClx thin films from the optical transmission and reflection measurements. The dispersion of the complex refractive index is evaluated using the Wemple–DiDomenico single oscillator model. The oscillator energy (E0) of CH3NH3PbI3−xClx follows by an empirical relationship with optical bandgap (Eg) as E0 ≈ 2.41 Eg for chemical dip coating, spray, and E0 ≈ 1.63 Eg for dipping deposited s les, respectively. The long wavelength refractive index, average oscillator wavelength, and oscillator strength are also determined using the Sellmeier oscillator equation. The estimated third-order nonlinear optical susceptibility is found to be the order of 10−12 esu. The incident photon and charge carrier interaction in CH3NH3PbI3−xClx is studied from the dielectric response of the s les. The charge carrier excitation is found higher at lower wavelength and experienced bulk excitation in volume while surface excitation on the surface region. The optical conductivity of CH3NH3PbI3−xClx is notably high, which leads to an increase in carrier transfer through the extrinsic halide perovskite material expedient for higher conversion efficiency. The highest theoretical efficiency of CH3NH3PbI3−xClx is estimated to be 17.4%, which is in excellent agreement with the experimental report. From photosensitivity study, it is confirmed that CH3NH3PbI3−xClx films are highly photosensitive. All these results comprehend that CH3NH3PbI3−xClx is a potential candidate for photonic applications.
Publisher: IOP Publishing
Date: 2020
DOI: 10.1088/1742-6596/1412/13/132016
Abstract: CH 3 NH 3 PbI 3-x Cl x crystalline film composed of cuboids and polyhedral structure was prepared by dipping and withdrawing method at ambient. X-ray diffraction shows the presence of tetragonal and cubic phases having high absorption coefficient of 10 6 m -1 . Photoluminescence study confirms shallow and deep level emissions. Temperature dependent-cathodoluminescence shows a green luminescence at 2.51 eV accompanied by weak red and ultraviolet luminescence at 80 and 300 K.
Publisher: Springer Science and Business Media LLC
Date: 24-05-2021
DOI: 10.1038/S41598-021-90247-X
Abstract: In this paper we explain the temperature dependence of excitonic effective mass and charge carrier conduction mechanism occurs in CH 3 NH 3 PbI 3−x Cl x thin films prepared by chemical dip coating (CDC), spray pyrolysis (Spray) and repeated dipping-withdrawing (Dipping). Hall Effect study confirmed that prepared CH 3 NH 3 PbI 3−x Cl x s les are p-type semiconductor having carrier concentration of the order of ~ 10 16 cm −3 . The charge carrier mobility, mean free path and mean free life time were found to decrease with increasing temperature due to polaronic effect. The excitonic effective mass is estimated to (0.090–0.196)m e and excitonic binding energy (15–33) meV, well consistent with Wannier-Mott hydrogenic model and the nature of exciton is likely to be Mott-Wannier type. From electrical measurement, it was observed that charge carrier conduction in CH 3 NH 3 PbI 3−x Cl x is governed by migration of $${\\mathrm{I}}^{-}$$ I - and CH 3 N $${\\mathrm{H}}_{3}^{+}$$ H 3 + vacancies and vacancy-assisted diffusion processes depending on temperature.
Publisher: Elsevier BV
Date: 12-2021
Publisher: IOP Publishing
Date: 05-2015
Publisher: Elsevier BV
Date: 06-2018
Publisher: Springer Science and Business Media LLC
Date: 26-10-2018
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 10-2017
Publisher: American Chemical Society (ACS)
Date: 25-06-2021
Publisher: Elsevier BV
Date: 2016
Publisher: Wiley
Date: 19-06-2018
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 08-2018
Publisher: Springer Science and Business Media LLC
Date: 25-10-2017
Publisher: IOP Publishing
Date: 05-2019
Abstract: First-principles calculations are employed to investigate and compare the structural, elastic and optical properties of tantalum hemicarbide Ta 2 C and tantalum monocarbide TaC. Calculated lattice constants of these carbides are in good agreement with available theoretical and experimental results. The mechanical stability of these carbides is affirmed by the estimated values of elastic constants. The estimated values of Vickers hardness indicate that TaC is harder than Ta 2 C. The values of Pugh’s ratio and Poisson’s ratio suggest the brittle nature of both Ta 2 C and TaC. The optical properties of Ta 2 C along two polarization directions [001] and [100] are studied in details for the first time. Our study shows that the optical properties of both Ta 2 C and TaC compounds compliment the electronic structure calculations. Optical constants of Ta 2 C show significant dependence of the state of polarization of the incident electric field, and predict this material as optically anisotropic.
Publisher: Springer International Publishing
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 11-06-2019
Publisher: IOP Publishing
Date: 23-02-2015
Publisher: Springer Science and Business Media LLC
Date: 18-10-2023
Publisher: Elsevier BV
Date: 09-2017
Publisher: American Chemical Society (ACS)
Date: 18-04-2022
Publisher: Springer Science and Business Media LLC
Date: 28-01-2021
DOI: 10.1007/S42452-021-04214-2
Abstract: Intermetallic compounds with CaAl 2 Si 2 -type structure have been studied extensively due to their exciting set of physical properties. Among various alumo-germanides, MgAl 2 Ge 2 is the new representative of CaAl 2 Si 2 -type structures. Our previous study explores the structural aspects, mechanical behaviors and electronic features of intermetallic MgAl 2 Ge 2 . The present work discloses the results of optoelectronic, thermodynamic and vibrational properties of MgAl 2 Ge 2 via density functional theory-based investigations. The band structure calculations suggest that MgAl 2 Ge 2 possesses slight electronic anisotropy and the compound is metallic. The Fermi surface topology reveals that both electron- and hole-like sheets are present in MgAl 2 Ge 2 . The electron charge density map indicates toward the dominance of covalent bonding in MgAl 2 Ge 2 . The optical parameters are found to be independent of the state of the polarization of incident electric field. The large value of the reflectivity in the visible-to-ultraviolet region up to ~ 15 eV suggests that MgAl 2 Ge 2 might be a good candidate as coating material to avoid solar heating. The thermodynamic properties have been calculated using the quasi-harmonic Debye approximation. We have found indications of lattice instability at the Brillouin zone boundary in the trigonal $$P\\overline{3}m1$$ P 3 ¯ m 1 phase from the phonon dispersion curves. However, the compound might be stable at elevated temperature and as a function of pressure. All the theoretical findings herein have been compared with the reported results (where available). Various implications of our results have been discussed in detail. Graphic abstract
Location: Bangladesh
No related grants have been discovered for Al Momin Md Tanveer Karim.