二维Janus晶体的室温合成及其异质结构,Advanced Materials

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二维Janus晶体的室温合成及其异质结构
Advanced Materials ( IF 27.4 ) Pub Date : 2020-11-11 , DOI: 10.1002/adma.202006320
Dipesh B. Trivedi ₁ , Guven Turgut ₁ , Ying Qin ₁ , Mohammed Y. Sayyad ₁ , Debarati Hajra ₁ , Madeleine Howell ₁ , Lei Liu ₁ , Sijie Yang ₁ , Naim Hossain Patoary ₁ , Han Li ₁ , Marko M. Petrić ₂ , Moritz Meyer ₂ , Malte Kremser ₃ , Matteo Barbone ₂ , Giancarlo Soavi ₄ , Andreas V. Stier ₃ , Kai Müller ₂ , Shize Yang ₁ , Ivan Sanchez Esqueda ₁ , Houlong Zhuang ₁ , Jonathan J. Finley ₃ , Sefaattin Tongay ₁

Affiliation

贾纳斯（Janus）晶体代表一类激动人心的2D材料，其上，下端面具有不同的原子种类。理论预言，这种对称性破坏会感应电场并导致大量新特性，例如大的Rashba自旋轨道耦合和强相关电子态的形成。单层MoSSe Janus晶体已通过两种方法合成，分别是通过单层MoSe _2的受控硫化和通过等离子汽提然后MoS _2的热退火进行的。但是，较高的加工温度会阻止其他Janus材料及其异质结构的生长。在这里，报道了一种室温技术，用于合成具有高结构和光学质量的多种Janus单层。此过程涉及低能量的反应性自由基前体，可选择性去除和置换最上层的硫属元素层，从而将经典的过渡金属二卤化物转化为Janus结构。所得材料在其激子跃迁中表现出明显的混合特性，更重要的是，本文提出的室温方法能够演示2D Janus TMD的第一个垂直和横向异质结。结果显示了在合成新型2D材料方面的重大突破性进展，

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Room‐Temperature Synthesis of 2D Janus Crystals and their Heterostructures

Janus crystals represent an exciting class of 2D materials with different atomic species on their upper and lower facets. Theories have predicted that this symmetry breaking induces an electric field and leads to a wealth of novel properties, such as large Rashba spin–orbit coupling and formation of strongly correlated electronic states. Monolayer MoSSe Janus crystals have been synthesized by two methods, via controlled sulfurization of monolayer MoSe₂ and via plasma stripping followed thermal annealing of MoS₂. However, the high processing temperatures prevent growth of other Janus materials and their heterostructures. Here, a room‐temperature technique for the synthesis of a variety of Janus monolayers with high structural and optical quality is reported. This process involves low‐energy reactive radical precursors, which enables selective removal and replacement of the uppermost chalcogen layer, thus transforming classical transition metal dichalcogenides into a Janus structure. The resulting materials show clear mixed character for their excitonic transitions, and more importantly, the presented room‐temperature method enables the demonstration of first vertical and lateral heterojunctions of 2D Janus TMDs. The results present significant and pioneering advances in the synthesis of new classes of 2D materials, and pave the way for the creation of heterostructures from 2D Janus layers.

更新日期：2020-12-15

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