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Nano-“Squeegee” for the Creation of Clean 2D Material Interfaces
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acsami.8b01224
Matthew R. Rosenberger 1 , Hsun-Jen Chuang 1 , Kathleen M. McCreary 1 , Aubrey T. Hanbicki 1 , Saujan V. Sivaram 1 , Berend T. Jonker 1
Affiliation  

Two-dimensional (2D) materials exhibit many exciting phenomena that make them promising as materials for future electronic, optoelectronic, and mechanical devices. Because of their atomic thinness, interfaces play a dominant role in determining material behavior. In order to observe and exploit the unique properties of these materials, it is therefore vital to obtain clean and repeatable interfaces. However, the conventional mechanical stacking of atomically thin layers typically leads to trapped contaminants and spatially inhomogeneous interfaces, which obscure the true intrinsic behavior. This work presents a simple and generic approach to create clean 2D material interfaces in mechanically stacked structures. The operating principle is to use an AFM tip to controllably squeeze contaminants out from between 2D layers and their substrates, similar to a “squeegee”. This approach leads to drastically improved homogeneity and consistency of 2D material interfaces, as demonstrated by AFM topography and significant reduction of photoluminescence line widths. Also, this approach enables emission from interlayer excitons, demonstrating that the technique enhances interlayer coupling in van der Waals heterostructures. The technique enables repeatable observation of intrinsic 2D material properties, which is crucial for the continued development of these promising materials.

中文翻译:

纳米“吸水扒”,用于创建干净的2D材料界面

二维(2D)材料表现出许多令人兴奋的现象,使其成为有前途的电子,光电和机械设备的材料。由于其原子薄,界面在确定材料行为方面起着主导作用。为了观察和利用这些材料的独特性能,因此获得干净且可重复的界面至关重要。然而,原子薄层的常规机械堆叠通常导致捕获的污染物和空间不均匀的界面,这掩盖了真实的内在行为。这项工作提出了一种简单而通用的方法来在机械堆叠结构中创建干净的2D材料界面。工作原理是使用AFM尖端可控地将污染物从2D层及其基材之间挤出,类似于“吸水扒”。这种方法可以极大地改善2D材料界面的均匀性和一致性,正如AFM形貌所证明的那样,并且可以显着减小光致发光线的宽度。同样,这种方法能够实现层间激子的发射,这表明该技术增强了范德华异质结构中的层间耦合。该技术能够重复观察固有的2D材料属性,这对于这些有前途的材料的持续开发至关重要。说明该技术增强了范德华异质结构中的层间耦合。该技术能够重复观察固有的2D材料属性,这对于这些有前途的材料的持续开发至关重要。说明该技术增强了范德华异质结构中的层间耦合。该技术能够重复观察固有的2D材料属性,这对于这些有前途的材料的持续开发至关重要。
更新日期:2018-03-06
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