Enhanced visible light photodetection properties of Pb-doped SnS nanostructures synthesized via sonochemical method

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

Optical Materials Pub Date : 2025-09-20 DOI:10.1016/j.optmat.2025.117544

Rouhollah Namazi-Rizi , Farid Jamali-Sheini , Mohsen Cheraghizade

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Abstract

This study investigates the synthesis, structural, optical, and electrical characterization of lead (Pb)-doped tin sulfide (SnS) nanostructures synthesized via a sonochemical method for application in photodetectors. The introduction of Pb dopants was found to reduce crystallite and particle sizes (except the sample with the lowest Pb concentration), induce lattice strain, and increase carrier concentration, thereby modifying the material's physical and electronic properties while preserving the orthorhombic SnS phase. Optical analyses demonstrated tunable band gap energy variations correlated with doping levels. The results indicate that the band gap energies decrease with increasing Pb concentration. Electrical measurements confirmed p-type conductivity, accompanied by improved charge transport characteristics. Photodetectors fabricated from these nanostructures exhibited enhanced performance metrics, including higher photocurrent intensity, increased optical sensitivity, faster response times, and better detectivity relative to undoped SnS devices. The optimized Pb-doped SnS nanostructures show promise as cost-effective and environmentally friendly materials for optoelectronic devices operating across visible spectral ranges.

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声化学方法合成的铅掺杂SnS纳米结构的可见光检测性能增强

本文研究了用声化学方法合成的用于光电探测器的铅掺杂硫化锡纳米结构的合成、结构、光学和电学特性。发现Pb掺杂剂的引入可以减小晶体和颗粒尺寸（除了Pb浓度最低的样品），诱导晶格应变，增加载流子浓度，从而改变材料的物理和电子性能，同时保持正交SnS相。光学分析表明，可调谐的带隙能量变化与掺杂水平相关。结果表明，带隙能随Pb浓度的增加而减小。电学测量证实了p型电导率，并伴有电荷输运特性的改善。与未掺杂的SnS器件相比，由这些纳米结构制成的光电探测器表现出更高的性能指标，包括更高的光电流强度、更高的光学灵敏度、更快的响应时间和更好的探测性。优化后的掺杂铅的SnS纳米结构有望成为在可见光谱范围内工作的光电器件的成本效益和环保材料。

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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.