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In the last two decades, the family of metal halide perovskites has received more attention in radiation detection applications. In this work, the radiation detection and dosimetric applicability of the CsPbBr 3 thin film will be investigated. The impact of gamma irradiation on the structural, morphological, optical, and electrical properties of the CsPbBr 3 thin film has been studied. The CsPbBr 3 thin film was synthesized using a thermal evaporation deposition technique. The deposited thin films were exposed to different gamma-ray doses (0, 25, 50, 75, and 100 kGy) using a 60Co gamma source with an activity of 7.328 kGy/h. X-ray diffraction analysis of the thin films confirmed the orthorhombic crystal structure and also showed an increase in the crystalline and crystallite sizes, whereas the dislocation density and microstrain decreased as the gamma dose increased. Field-emission scanning electron microscopy results revealed that the surface morphology changed considerably due to gamma exposure. The optical properties exhibited a decreasing energy band gap value (from 2.35 to 2.14 eV) as the radiation dosage increased, which may have been due to the increasing crystallite size and induced defects. The photoluminescence (PL) peaks shifted toward longer wavelengths and intensity, while the full width half maxima of PL peaks increased along with the gamma dose, which was attributed to spectral broadening and enhancement in the recombination rate of electron–hole pairs. Impedance spectroscopy of all the irradiated samples showed the single semicircle feature, which is similar to that observed in the case of unirradiated samples. The grain boundary resistance reduced gradually as the gamma dosage increased. The achieved outcomes proved that the structural defects induced by gamma exposure had a superficial influence on the structural, morphological, optical, PL, and impedance properties of CsPbBr 3 thin films. The impact of gamma dose on the properties makes CsPbBr 3 thin films significantly useful as sensing materials. [ABSTRACT FROM AUTHOR]

Magnetic double perovskites have garnered significant interest due to their unique magnetic properties and are promising candidates for various spintronic applications. Spin-polarized method is used to investigate the physical attributes of magnetic cubic double perovskites Cs 2 XCeI 6 (X = Li, Na) using density functional theory. Elastic constants and mechanical properties are evaluated to assess the mechanical stability of studied perovskites. The confirmation of the structure stability is accomplished via formation and cohesive energies, optimization plots, octahedral tilting and tolerance factor. Electronic properties revealed that Cs 2 LiCeI 6 possess an indirect bandgap of 2.06 eV and 2.43 eV in spin up and down channels, and Cs 2 NaCeI 6 have an indirect bandgap of 2.30eV and 2.64 eV in spin up and down channels, respectively. The computed magnetic moment for both perovskites is reported as 1 μ B. Kramers-Kronig complex equations are used to analyze the optical behavior. The peak absorption in the UV range is revealed with minimal energy loss for both perovskites. The maximum peaks for optical conductivity and extinction coefficient also observed in UV spectrum. According to an analysis of the derived properties, optoelectronics and spintronic are two areas for which these double perovskites are well suited. [ABSTRACT FROM AUTHOR]

• The effects of compressional strain on double perovskite Rb 3 TlCl 6 using DFT is studied. • The optimization cures, negative formation energy and tolerance factor show the stability. • The compressional strain ranging from 10 % to 70 % resulted into substantial reduction in the bandgap. • A prominent shift in the optical properties towards the visible region after applying the strain is seen. Bandgap engineering provides diverse modifications in semiconducting materials which leads to a wide range of technological applications. In this work, we have employed the effects of compressional strain on double perovskite Rb 3 TlCl 6 using DFT. First and foremost the crystal structure is relaxed via volume optimization. The attained tolerance factor and octahedral tilting values ensure structural stability and cubic formation at room temperature. Rb 3 TlCl 6 when subjected to the compressional strain ranging from 10 % to 70 % resulted into substantial decline in the bandgap from 2.37 eV to 1.88 eV. The computed elastic constants for all applied compressional strains ensure complete mechanical stability. Ductile, anisotropic and endurance to high melting temperatures are reveled via mechanical properties for applied strain effects. The optical properties signify a prominent shift in the properties of Rb 3 TlCl 6 towards the visible region which shows the ability of strain engineering to alter the optical properties of materials, providing opportunities for tailoring their features for a variety of technological applications such as optoelectronics. [ABSTRACT FROM AUTHOR]

• The structural, elastic, electronic, magnetic, and optical properties of vacancy-ordered Rb 2 TcCl 6 have been thoroughly examined through the use of first-principles calculations. • The stability of Rb 2 TcCl 6 is demonstrated by the formation energy, optimization curves and phonon curves. • The spin-plarized electronic band structure and density of states (DOS) predict the semiconductor nature in both spin states. • The obtained magnetic moments for Rb 2 TcCl 6 reveal the potential of for spintronics. • An optical band gap with maximum absorption reveals that this compound is also useful for the application in optoelectronics. Due to their versatile properties, vacancy-ordered double perovskites offer a wide range of potential uses due to their versatile properties. We have thoroughly examined the physical characteristics of vacancy-ordered Rb 2 TcCl 6 in its cubic phase by employing the spin-polarized computations. The ground state energy and optimum structural parameters are obtained in order to assess the structural stability, which is further validated using the tolerance factor and formation energy values. The ductile character of Rb 2 TcCl 6 is revealed by a comprehensive evaluation of mechanical properties. Vickers hardness factor suggests that Rb 2 TcCl 6 can withstand against pressure-induced disturbance more strongly. A direct bandgap for spin-up is measured up to 2.33 eV, while for spin-dn it is 2.02 eV. According to the magnetic moments of 2.69 μ B , Rb 2 TcCl 6 is an attractive material for spintronic devices. A number of optical parameters are determined. For optoelectronic applications, Rb 2 TcCl 6 is an excellent choice due to its strong polarization in the visible and ultraviolet regions, as shown by its optical characteristics. [ABSTRACT FROM AUTHOR]

The crystallization techniques of organic-inorganic hybrid perovskites (OIHP) are considered an effective method for light collector or light emitting applications. In this article, the optical band gap, electron-hole behavior, and energy band alignment are all key optoelectronic properties of crystalline perovskite structures studied in this study. For this reason, a perovskite solution was prepared in a single step and tetrahydrofuran (THF) was used as a solvent to dissolve both perovskite precursors. Rapid crystallization of perovskite in solution was observed, preventing the formation of homogenous perovskite thin films. Subsequently, the effect of THF solvent on the direct crystallization of MAPbI 3 perovskite without thermal annealing was investigated. Thermal annealing is considered necessary for perovskite crystal formation as it gives the molecules enough thermal energy to self-organize and form a well-ordered crystalline layer. The procedures that create perovskite crystals without thermal annealing give a novel method for room temperature film preparation (RT) and pave the way for the manufacture of low-cost, stable perovskite solar cells (PSCs). UV–vis absorption/reflectance, photoluminescence, XRD, and SEM were used to explore the effects of this approach on the optical and structural properties of MAPbI 3 perovskite thin films. • Crystallizing Growth of MAPbI 3 Perovskite Nanorod was demonstrated. • Perovskite precursor solution in THF is dried to form perovskite powder. • Fabrication of perovskite films without annealing. • Perovskite films were tested under ns laser. • The strong light emission allows the observation of ASE. [ABSTRACT FROM AUTHOR]