Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics
Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics
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用于自旋电子学的范德华异质结构的可移动式转移和堆叠
DOI：
10.1109/access.2020.2984942
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Zhao Weisheng
中科院分区：
文献类型：
--
作者：
Cao Yuan;Wang Xinhe;Lin Xiaoyang;Yang Wei;Lv Chen;Lu Yuan;Zhang Youguang;Zhao Weisheng
由各种二维（2D）材料制成的高质量和实用的范德华异质结构器件的关键在于对清洁和柔性界面的有效控制。受中国古代四大发明之一的“活字印刷”的启发，我们展示了二维材料的“活字”转移和堆叠，利用预制聚乙烯醇（PVA）薄膜来设计与二维材料的界面粘附，为二维材料提供了一种灵活、高效和可批量的转移方案。实验还验证了“可动型”转移可以精确地控制二维材料的位置和方向，满足了扭曲石墨烯和其他异质结构制备等新兴需求。重要的是，PVA膜的水溶性确保了材料的理想界面而不会引入污染。我们用wse2垂直自旋阀装置说明了该方法的优越性，其性能验证了该方法在自旋电子学中的适用性和优越性。我们的pva辅助“可移动型”转移工艺可以促进高性能2d材料基器件的发展。
The key to achieving high-quality and practical van der Waals heterostructure devices made from various two-dimensional (2D) materials lies in the efficient control over clean and flexible interfaces. Inspired by the “movable-type printing”, one of the four great inventions of ancient China, we demonstrate the “movable-type” transfer and stacking of 2D materials, which utilizes prefabricated polyvinyl alcohol (PVA) film to engineer the interfacial adhesion to 2D materials, and provides a flexible, efficient and batchable transfer scheme for 2D materials. The experiments also verify the “movable-type” transfer can preciously control the position and orientation of 2D materials, which meets the burgeoning requirements such as the preparation of twisted graphene and other heterostructures. Importantly, water-solubility of PVA film ensures an ideal interface of the materials without introducing contamination. We illustrate the superiority of this method with a WSe2vertical spin valve device, whose performance verifies the applicability and advantages of such a method for spintronics. Our PVA-assisted “movable-type” transfer process may promote the development of high-performance 2D-material-based devices.