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Centimeter-Scale 2D van der Waals Vertical Heterostructures Integrated on Deformable Substrates Enabled by Gold Sacrificial Layer-Assisted Growth. | LitMetric

AI Article Synopsis

  • - Two-dimensional transition metal dichalcogenides (TMDs), like MoS and WS, have unique properties that make them ideal for flexible high-tech electronics, but integrating them onto flexible surfaces at a large scale has been a challenge.
  • - Traditional methods for transferring these materials are limited and often harm their properties, necessitating a new approach for better large-scale application.
  • - This study presents a novel technique that uses water-assisted debonding with a gold layer to grow and transfer TMDs onto flexible substrates, demonstrating the capability to create functional devices like 2D MoS/SWNT heterojunctions which can rectify current and respond to light.

Article Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDs) such as molybdenum or tungsten disulfides (MoS or WS) exhibit extremely large in-plane strain limits and unusual optical/electrical properties, offering unprecedented opportunities for flexible electronics/optoelectronics in new form factors. In order for them to be technologically viable building-blocks for such emerging technologies, it is critically demanded to grow/integrate them onto flexible or arbitrary-shaped substrates on a large wafer-scale compatible with the prevailing microelectronics processes. However, conventional approaches to assemble them on such unconventional substrates via mechanical exfoliations or coevaporation chemical growths have been limited to small-area transfers of 2D TMD layers with uncontrolled spatial homogeneity. Moreover, additional processes involving a prolonged exposure to strong chemical etchants have been required for the separation of as-grown 2D layers, which is detrimental to their material properties. Herein, we report a viable strategy to universally combine the centimeter-scale growth of various 2D TMD layers and their direct assemblies on mechanically deformable substrates. By exploring the water-assisted debonding of gold (Au) interfaced with silicon dioxide (SiO), we demonstrate the direct growth, transfer, and integration of 2D TMD layers and heterostructures such as 2D MoS and 2D MoS/WS vertical stacks on centimeter-scale plastic and metal foil substrates. We identify the dual function of the Au layer as a growth substrate as well as a sacrificial layer which facilitates 2D layer transfer. Furthermore, we demonstrate the versatility of this integration approach by fabricating centimeter-scale 2D MoS/single walled carbon nanotube (SWNT) vertical heterojunctions which exhibit current rectification and photoresponse. This study opens a pathway to explore large-scale 2D TMD van der Waals layers as device building blocks for emerging mechanically deformable electronics/optoelectronics.

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Source
http://dx.doi.org/10.1021/acs.nanolett.7b02776DOI Listing

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