Lead-free antimony doped Cesium bismuth iodide (Cs3(Bi1-xSbx)2I9) single crystals for high temperature optoelectronic and sensing applications

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-09-25 DOI:10.1016/j.optmat.2025.117541

Bharti Chandrakar , Topeswar Meher , Anil K. Sharma , Jitendra Yadav , Pawan Kumar , Sudhir Kumar , Jai Singh , P. Rambabu , Shalinta Tigga , S.A. Khan , H.P. Bhaskar , Vineet K. Singh , Dhirendra K. Chaudhary , Shiv P. Patel

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引用次数: 0

Abstract

In this work, we report the growth of high-quality single crystals of Cs₃Bi₂I₉, Cs₃(Bi_0.9Sb_0.1)₂I₉, and Cs₃(Bi_0.8Sb_0.2)₂I₉, with sizes of ∼5 mm, 3 mm, and 0.5 mm, respectively, using the inverse temperature crystallization (ITC) method. The structural and vibrational stability of these crystals was systematically evaluated by temperature-dependent Raman spectroscopy over the range of -175–245 °C. The Raman profiles confirm excellent thermal robustness, with no observable phase change or lattice distortions across the studied temperature window. Furthermore, electrical characterizations reveal enhanced conductivity and a significant reduction in trap state density, indicative of improved charge transport dynamics. The incorporation of antimony into the Cs₃Bi₂I₉ lattice is shown to effectively modulate the electrical and vibrational properties, providing a pathway for property tuning. Our findings demonstrate the potential of Sb-doped Cs₃Bi₂I₉ single crystals as promising, environmentally benign candidates for high-temperature optoelectronic and sensing devices.

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无铅锑掺杂碘化铯铋（Cs3(Bi1-xSbx)2I9）单晶，用于高温光电和传感应用

在这项工作中，我们报道了Cs3Bi2I9， Cs3(Bi0.9Sb0.1)2I9和Cs3(Bi0.8Sb0.2)2I9的高质量单晶的生长，尺寸分别为~ 5 mm， 3 mm和0.5 mm。在-175-245°C范围内，用温度依赖拉曼光谱系统地评价了这些晶体的结构和振动稳定性。拉曼曲线证实了优异的热鲁棒性，在研究的温度窗内没有观察到相变或晶格畸变。此外，电学表征显示电导率增强，陷阱态密度显著降低，表明电荷传输动力学得到改善。在Cs3Bi2I9晶格中掺入锑可以有效地调节其电学和振动特性，为性质调谐提供了一条途径。我们的发现证明了sb掺杂Cs3Bi2I9单晶作为高温光电和传感器件的有前途的、环境友好的候选材料的潜力。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.