Efficient carrier transfer in the van der Waals straddling heterostructure

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-04-22 DOI:10.1016/j.vacuum.2025.114364

Xiangna Cong , Muhammad Najeeb Ullah Shah , Wenlong He

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引用次数: 0

Abstract

van der Waals (vdW) two-dimensional (2D) materials have the capability to fabricate heterostructures with a diverse range of adjustable bandgaps, which has created a multitude of possibilities in the field of optoelectronics applications. This study comprehensively analyses the SnS₂/SnSe₂ heterostructure, uncovering a type-I band alignment that considerably enhances electron-hole recombination and energy transfer. First-principles density functional theory (DFT) analysis shows that the conduction band minimum (CBM) and valence band maximum (VBM) of SnSe₂ fall within the CBM and VBM of SnS₂, thereby confirming the existence of type I band alignment. Photoluminescence (PL) spectroscopy reveals efficient energy transfer from SnS₂ to SnSe₂, leading to enhanced PL intensity in SnSe₂. These results propose that combining SnSe₂ and SnS₂ creates a heterostructure that facilitates stable and efficient energy transfer, placing it as a promising candidate for next-generation optoelectronics.

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范德华跨层异质结构中的高效载流子传输

范德华（vdW）二维（2D）材料具有制造具有各种可调带隙的异质结构的能力，这在光电子应用领域创造了多种可能性。本研究全面分析了SnS2/SnSe2的异质结构，发现了一种显著增强电子-空穴复合和能量转移的i型带对准。第一性原理密度泛函理论（DFT）分析表明，SnSe2的导带最小值（CBM）和价带最大值（VBM）落在SnS2的CBM和VBM之内，从而证实了I型带对准的存在。光致发光（PL）光谱揭示了SnS2到SnSe2的有效能量转移，导致SnSe2的光致发光强度增强。这些结果表明，结合SnSe2和SnS2可以产生一种异质结构，促进稳定和高效的能量转移，使其成为下一代光电子学的有希望的候选者。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.