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The increasing demand for eco-friendly and stable optoelectronic materials has led to interest in all-inorganic lead-free halide perovskites. This study reports the synthesis of A3Bi2I9 (A = Cs, Rb) perovskites via a solvothermal technique. The materials crystallize in hexagonal and monoclinic structures, with micrometer-sized particles. Optical in...
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... However, several critical challenges remain, hindering their widespread commercial adoption. Among the most prominent obstacles are lead toxicity, sensitivity to environmental conditions (such as air and moisture), and instability in the crystalline phase of the material [6][7][8][9][10]. ...
... However, at higher frequencies, some hops become less efficient, resulting in dispersive conductivity. The formation of polarons in Cs 2 SnBr 6 is attributed to lattice distortions caused by the introduction of additional charge carriers [10]. These polarons are localized and do not overlap with each other. ...
Lead‐free tin halide perovskites, particularly Cs2SnBr6, are gaining significant attention for their potential in optoelectronic applications. In this study, we investigate the material's electrical and vibrational properties under varying illumination conditions, providing novel insights into the impact of light on its conduction mechanisms. Cs2SnBr6 was synthesized via liquid‐phase and solid‐state reactions, and we report comprehensive analyses of its impedance, AC conductivity, and dielectric properties over a wide frequency range. Notably, our results reveal that light‐induced photogenerated charge carriers enhance conductivity, which is well explained by the overlapping large‐polaron tunneling (OLPT) model, while in darkness, the material follows the correlated barrier hopping (CBH) model. Moreover, Raman spectroscopy highlights structural changes, including a slight shortening of Sn–Br bond distances under illumination, which influences the vibrational frequencies and intensities. These findings emphasize the crucial role of illumination in tuning the electrical and dielectric responses of Cs2SnBr6, thus demonstrating its considerable promise for future optoelectronic applications, such as solar cells and photodetectors.
The search for advanced materials with tunable electronic and optical properties has driven significant progress in energy storage and optoelectronic technology. Lithium-based mixed-metal oxides stand out among these materials because of their excellent ionic conductivity and structural flexibility. This study focuses on examining the structural, electrical, and optical characteristics of Li2MgZrO4, a ternary oxide featuring a tetragonal layered structure (space group P42/nmc). The material was prepared using a solid-state synthesis method and its single-phase nature was validated by X-ray diffraction analysis combined with Rietveld refinement. Additionally, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were employed to evaluate the microstructural features and elemental distributions of the compounds. UV-vis-NIR spectroscopy revealed a direct bandgap of 3.41 eV, highlighting the material's potential for optoelectronic applications. Impedance spectroscopy studies demonstrated a non-Debye relaxation behavior and thermally activated conductivity. Examination of AC conductivity using Jonscher's power law and the overlapping large polaron tunneling (OLPT) model revealed that polaronic conduction mechanisms primarily govern charge transport. The activation energy (0.804 eV) further supported thermally activated conduction. These results highlight Li2MgZrO4 as a multifunctional material with considerable potential for applications in solid-state battery design, energy storage systems, and optoelectronic innovations.
Lead‐free double perovskites, such as Cs2AgInCl6, represent a promising class of materials for optoelectronic applications due to their favorable properties and environmental sustainability. This work focuses on the synthesis and comprehensive characterization of Cs2AgInCl6, employing a range of techniques including X‐ray diffraction (XRD) for structural verification, thermogravimetric analysis (TGA) to assess thermal stability, and UV–visible absorption measurements to determine the optical bandgap energy of 3.32 eV. Additionally, we explore photoluminescence (PL) and decay measurements to elucidate the luminescent properties of the compound. Complex impedance measurements are performed under both blue and red light to investigate the electrical behavior, revealing two distinct conduction mechanisms: the overlapping large–polaron tunneling (OLPT) and nonoverlapping small–polaron tunneling (NSPT). We analyze the implications of our findings on the current–voltage (I–V) behavior and trap density, further supported by Raman spectroscopy under both illumination conditions. The combined insights from optical and electrical characterizations highlight the potential of Cs2AgInCl6 in optical applications, paving the way for its use in advanced optoelectronic devices.
