Larger monolayers with gold tapes Although the exfoliation of monolayers of materials such as transition metal dichalcogenides produces high-quality electronic materials with low defect densities, the size of the monolayers is limited to the micrometer scale. Liu et al. modified this method by creating atomically flat gold layers on polymer supports. The strong van der Waals adhesion of the gold layer allowed monolayers to be exfoliated on the centimeter scale. Multilayers could be reassembled to artificial structures, such as a MoSe2/WSe2 single-crystal bilayer with a twist angle chosen to quench intralayer exciton formation. Science, this issue p. 903 A polymer-supported atomically flat gold tape exfoliated centimeter-scale monolayers of transition metal dichalcogenides. Two-dimensional materials from layered van der Waals (vdW) crystals hold great promise for electronic, optoelectronic, and quantum devices, but technological implementation will be hampered by the lack of high-throughput techniques for exfoliating single-crystal monolayers with sufficient size and high quality. Here, we report a facile method to disassemble vdW single crystals layer by layer into monolayers with near-unity yield and with dimensions limited only by bulk crystal sizes. The macroscopic monolayers are comparable in quality to microscopic monolayers from conventional Scotch tape exfoliation. The monolayers can be assembled into macroscopic artificial structures, including transition metal dichalcogenide multilayers with broken inversion symmetry and substantially enhanced nonlinear optical response. This approach takes us one step closer to mass production of macroscopic monolayers and bulk-like artificial materials with controllable properties.

中文翻译：

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将二维范德华晶体分解成宏观单层并重新组装成人工晶格

带有金带的更大单层 虽然对过渡金属二硫属化物等材料的单层剥离可生产出具有低缺陷密度的高质量电子材料，但单层的尺寸仅限于微米级。刘等人。通过在聚合物载体上创建原子平坦的金层来修改此方法。金层的强范德华粘附力允许单层在厘米尺度上剥离。多层可以重新组装成人工结构，例如 MoSe2/WSe2 单晶双层，其扭曲角被选择以淬灭层内激子的形成。科学，这个问题 p。903 聚合物支撑的原子扁平金带剥离厘米级过渡金属二硫属化物单层。来自分层范德华 (vdW) 晶体的二维材料在电子、光电子和量子器件方面具有广阔的前景，但由于缺乏用于剥离具有足够尺寸和高度的单晶单层的高通量技术，技术实施将受到阻碍。质量。在这里，我们报告了一种简便的方法，将 vdW 单晶逐层分解成单层，产量接近统一，尺寸仅受大块晶体尺寸的限制。宏观单层在质量上可与来自常规透明胶带剥离的微观单层相媲美。单层可以组装成宏观人工结构，包括具有破坏的反转对称性和显着增强的非线性光学响应的​​过渡金属二硫属化物多层。