在电化学势下打开 MoS2 异质结构交界处附近的肖特基势垒

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Kubra Aydin, Mansu Kim, Hyunho Seok, Chulwoo Bae, Jinhyoung Lee, Muyoung Kim, Jonghwan Park, Joseph T. Hupp, Dongmok Whang, Hyeong-U Kim, Taesung Kim
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引用次数: 0

摘要

由二维(2D)过渡金属二掺杂物(TMDc)材料组成的异质结构的探索,因其每种成分的独特性质及其与相位相关的独特性质而备受研究关注。利用等离子体增强化学气相沉积(PECVD)方法,我们分析了在四种不同情况下由二硫化钼(MoS2)的两个相组成的异质结构的制造。初始氢进化反应(HER)极化曲线表明,异质结构 MoS2 的活性与下层 MoS2 的活性一致,而不是上层 MoS2 的表面活性。这种行为可归因于肖特基势垒的存在,其中包括接触电阻,它在很大程度上阻碍了两种不同相态的 MoS2 层之间结点处的高效电荷转移,并由范德华键介导。值得注意的是,当达到一定的电化学电位时,交界处的能量势垒就会消散,这表明异质结构中的 MoS2 顶相表面活化。值得注意的是,1T/2H MoS2 异质结构的电化学稳定性比其蜕变的 1T-MoS2 更强。这一基本认识为通过实验可行的 PECVD 技术制造相位可控的异质结构铺平了道路,为广泛的应用提供了重要的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Unlocking of Schottky Barrier Near the Junction of MoS2 Heterostructure Under Electrochemical Potential

Unlocking of Schottky Barrier Near the Junction of MoS2 Heterostructure Under Electrochemical Potential
The exploration of heterostructures composed of two-dimensional (2D) transition metal dichalcogenide (TMDc) materials has garnered significant research attention due to the distinctive properties of each individual component and their phase-dependent unique properties. Using the plasma-enhanced chemical vapor deposition (PECVD) method, we analyze the fabrication of heterostructures consisting of two phases of molybdenum disulfide (MoS2) in four different cases. The initial hydrogen evolution reaction (HER) polarization curve indicates that the activity of the heterostructure MoS2 is consistent with that of the underlying MoS2, rather than the surface activity of the upper MoS2. This behavior can be attributed to the presence of Schottky barriers, which include contact resistance, which significantly hampers the efficient charge transfer at junctions between the two different phases of MoS2 layers and is mediated by van der Waals bonds. Remarkably, the energy barrier at the junction dissipates upon reaching a certain electrochemical potential, indicating surface activation from the top phase of MoS2 in the heterostructure. Notably, the 1T/2H MoS2 heterostructure demonstrates enhanced electrochemical stability compared to its metastable 1T-MoS2. This fundamental understanding paves the way for the creation of phase-controllable heterostructures through an experimentally viable PECVD, offering significant promise for a wide range of applications.
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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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