Centimeter-scale Green Integration of Layer-by-Layer 2D TMD vdW Heterostructures on Arbitrary Substrates by Water-Assisted Layer Transfer
Centimeter-scale Green Integration of Layer-by-Layer 2D TMD vdW Heterostructures on Arbitrary Substrates by Water-Assisted Layer Transfer
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DOI：
10.1038/s41598-018-37219-w
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发表时间：
2019-02-07
影响因子：
4.6
通讯作者：
Jung, Yeonwoong
中科院分区：
文献类型：
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作者：
Kim, Jung Han;Ko, Tae-Jun;Jung, Yeonwoong
二维 (2D) 过渡金属二硫属化物 (2D TMD) 层呈现出优异的光电特性和机械公差的异常理想的组合，为各种新兴应用（特别是在柔性和可拉伸设备中）带来了广阔的前景。实现这些机会的先决条件是通过从刚性生长基底转移将具有明确尺寸的大面积二维 TMD 可靠地集成到具有目标功能的机械柔韧材料上。克服这一挑战的传统方法受到限制，因为它们经常受到二维 TMD 不可扩展集成的影响，而二维 TMD 的结构和化学完整性会通过涉及有毒化学品的过程而改变。在此，我们报告了一种通用且可靠的策略，以实现大面积 2D TMD 及其异质结构变化在各种非常规基板上的逐层集成。这种新的二维层集成方法仅使用水，不涉及任何其他化学物质，因此在材料特性保存和集成尺寸可扩展性方面比传统方法具有明显的优势。我们通过在塑料和纸张等特殊基材上集成各种 2D TMD 及其异构组装的垂直层，证明了该方法的通用性。此外，我们还通过展示基于厘米级 2D TMD 的柔性光电探测器和压力传感器来验证其技术的多功能性，这些传感器很难用传统方法制造。还讨论了二维 TMD 层水辅助自发分离的基本原理。
Two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers present an unusually ideal combination of excellent opto-electrical properties and mechanical tolerance projecting high promise for a wide range of emerging applications, particularly in flexible and stretchable devices. The prerequisite for realizing such opportunities is to reliably integrate large-area 2D TMDs of well-defined dimensions on mechanically pliable materials with targeted functionalities by transferring them from rigid growth substrates. Conventional approaches to overcome this challenge have been limited as they often suffer from the non-scalable integration of 2D TMDs whose structural and chemical integrity are altered through toxic chemicals-involved processes. Herein, we report a generic and reliable strategy to achieve the layer-by-layer integration of large-area 2D TMDs and their heterostructure variations onto a variety of unconventional substrates. This new 2D layer integration method employs water only without involving any other chemicals, thus renders distinguishable advantages over conventional approaches in terms of material property preservation and integration size scalability. We have demonstrated the generality of this method by integrating a variety of 2D TMDs and their heterogeneously-assembled vertical layers on exotic substrates such as plastics and papers. Moreover, we have verified its technological versatility by demonstrating centimeter-scale 2D TMDs-based flexible photodetectors and pressure sensors which are difficult to fabricate with conventional approaches. Fundamental principles for the water-assisted spontaneous separation of 2D TMD layers are also discussed.