Oriented Epitaxial Growth of Mixed-Dimensional van der Waals Heterostructures with One-Dimensional (1D) Bi2S3 Nanowires and Two-Dimensional (2D) WS2 Monolayers for Performance-Enhanced Photodetectors

IF 9.6 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-10-30 DOI:10.1021/acs.nanolett.4c04455
Ke Jiang, Qi You, Yue Zheng, Feier Fang, Zihao Xie, Henan Li, Yi Wan, Cheng Han, Yumeng Shi
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Abstract

The synthesis of mixed-dimensional van der Waals heterostructures with controlled alignment by chemical vapor deposition (CVD) technique remains a big challenge due to the complex epitaxial growth mechanism. Herein, we report the epitaxial growth of mixed-dimensional Bi2S3/WS2 heterostructures by a two-step CVD method. Bi2S3 crystals grown on 2D WS2 monolayers exhibit 1D feature with the preferred orientation, indicating a strong epitaxial growth behavior at the 1D/2D interface. Furthermore, the heterostructure was carefully characterized by transmission electron microscopy, which reveals the preferential growth of Bi2S3 nanowires along the zigzag edge of WS2 monolayers. The experimental results are also consistent with the theoretical calculations by DFT, where the preferred orientation possesses minimal surface energy. The strong interaction between Bi2S3 and WS2 enables efficient charge transfer of photogenerated carriers at the heterointerface, which leads to a largely improved light harvesting capability with the highest responsivity of ∼48.1 AW−1 and detectivity of ∼5.9 × 1012 Jones.

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定向外延生长一维 (1D) Bi2S3 纳米线和二维 (2D) WS2 单层的混维范德华异质结构,用于性能增强型光电探测器
由于复杂的外延生长机制,利用化学气相沉积(CVD)技术合成具有可控排列的混维范德华异质结构仍然是一个巨大的挑战。在此,我们报告了采用两步 CVD 法外延生长混合维度 Bi2S3/WS2 异质结构的情况。生长在二维 WS2 单层上的 Bi2S3 晶体呈现出具有优先取向的一维特征,这表明在一维/二维界面上有很强的外延生长行为。此外,透射电子显微镜对异质结构进行了仔细的表征,发现 Bi2S3 纳米线沿着 WS2 单层的人字形边缘优先生长。实验结果也与 DFT 理论计算结果一致,首选取向具有最小的表面能。Bi2S3 与 WS2 之间的强相互作用使得光生载流子能在异质界面上进行有效的电荷转移,从而在很大程度上提高了光收集能力,最高响应率达 ∼48.1 AW-1 ,检测率达 ∼5.9 × 1012 Jones。
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来源期刊
Nano Letters
Nano Letters 工程技术-材料科学:综合
CiteScore
16.80
自引率
2.80%
发文量
1182
审稿时长
1.4 months
期刊介绍: Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.
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