Structural and Electrical Characterization of Cs2SnBr6: Insights From Raman Spectroscopy and Conductivity Under Varying Light Conditions

IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED
Mohamed Bouzidi, Abdullah A. Alatawi, Achref Jebnouni, Safa Teka, Sayda Osman, Nuzaiha Mohamed, Raoudha Soury, Mohamed Ben Bechir
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Abstract

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.

Abstract Image

Cs2SnBr6的结构和电学表征:来自拉曼光谱和变光条件下电导率的见解
无铅卤化锡钙钛矿,特别是Cs2SnBr6,因其在光电应用中的潜力而受到广泛关注。在这项研究中,我们研究了材料在不同照明条件下的电学和振动特性,为光对其传导机制的影响提供了新的见解。通过液相和固相反应合成了Cs2SnBr6,并对其阻抗、交流电导率和宽频率范围内的介电性能进行了综合分析。值得注意的是,我们的研究结果表明,光诱导的光生电荷载流子增强了电导率,这可以用重叠大极化子隧道(OLPT)模型很好地解释,而在黑暗中,材料遵循相关势垒跳变(CBH)模型。此外,拉曼光谱显示了结构变化,包括在光照下Sn-Br键距离的轻微缩短,这影响了振动频率和强度。这些发现强调了照明在调节Cs2SnBr6的电和介电响应中的关键作用,从而展示了其在未来光电应用(如太阳能电池和光电探测器)方面的巨大前景。
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来源期刊
Applied Organometallic Chemistry
Applied Organometallic Chemistry 化学-无机化学与核化学
CiteScore
7.80
自引率
10.30%
发文量
408
审稿时长
2.2 months
期刊介绍: All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.
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