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Electronically Weak Coupled Bilayer MoS2 at Various Twist Angles via Folding
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-05-04 , DOI: 10.1021/acsami.1c03135 Xiaojia Du 1 , Yangjin Lee 2 , Yan Zhang 1 , Tianhao Yu 3 , Kwanpyo Kim 2 , Nan Liu 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-05-04 , DOI: 10.1021/acsami.1c03135 Xiaojia Du 1 , Yangjin Lee 2 , Yan Zhang 1 , Tianhao Yu 3 , Kwanpyo Kim 2 , Nan Liu 1
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Constructing a bilayer system with defined twist angles is an effective way to engineer the physical properties of two-dimensional (2D) materials, opening up a new research area of twistronics. How to achieve high-quality bilayer 2D materials in a controlled and mass production way is of primary importance to this emerging area. In this work, we present a strategy for the large-scale fabrication of twisted bilayer molybdenum disulfide (MoS2) through photolithography patterning and folding of single-crystal monolayer MoS2. Atomic resolution transmission electron spectroscopy directly confirms that the as-achieved folded bilayer MoS2 is of high quality with targeted twist angles. Various twist angles result in tuning Raman mode frequencies and direct optical transition energies. Due to the weak interlayer coupling between the twisted layers, folded bilayers exhibit an extremely high photoluminescence with doubled intensity as compared to the unfolded monolayer, indicating a possible application in optoelectronic devices. Our work provides a new strategy to tailor the properties of MoS2, which will be beneficial to twistable electronics.
中文翻译：
通过折叠以各种扭转角电子弱耦合双层MoS 2
构建具有定义的扭转角的双层系统是一种工程化二维（2D）材料物理特性的有效方法，从而开辟了新型的扭转学研究领域。如何以受控且批量生产的方式获得高质量的双层2D材料，对于这一新兴领域至关重要。在这项工作中，我们提出了一种通过光刻图案化和单晶单层MoS 2折叠来大规模制造扭曲双层二硫化钼（MoS 2）的策略。原子分辨率透射电子光谱直接证实了所获得的折叠双层MoS 2具有针对性的扭曲角度的高品质产品。各种扭转角会导致拉曼模式频率调谐和直接的光学跃迁能量。由于扭曲层之间薄弱的层间耦合，折叠的双层与未折叠的单层相比显示出极高的光致发光强度，且强度提高了一倍，这表明它可能在光电器件中得到应用。我们的工作提供了一种新的策略来定制MoS 2的特性，这将有利于可扭曲的电子产品。
更新日期：2021-05-19
中文翻译：
通过折叠以各种扭转角电子弱耦合双层MoS 2
构建具有定义的扭转角的双层系统是一种工程化二维（2D）材料物理特性的有效方法，从而开辟了新型的扭转学研究领域。如何以受控且批量生产的方式获得高质量的双层2D材料，对于这一新兴领域至关重要。在这项工作中，我们提出了一种通过光刻图案化和单晶单层MoS 2折叠来大规模制造扭曲双层二硫化钼（MoS 2）的策略。原子分辨率透射电子光谱直接证实了所获得的折叠双层MoS 2具有针对性的扭曲角度的高品质产品。各种扭转角会导致拉曼模式频率调谐和直接的光学跃迁能量。由于扭曲层之间薄弱的层间耦合，折叠的双层与未折叠的单层相比显示出极高的光致发光强度，且强度提高了一倍，这表明它可能在光电器件中得到应用。我们的工作提供了一种新的策略来定制MoS 2的特性，这将有利于可扭曲的电子产品。
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