High-yield exfoliation of 2D semiconductor monolayers and reassembly of organic/inorganic artificial superlattices
High-yield exfoliation of 2D semiconductor monolayers and reassembly of organic/inorganic artificial superlattices
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DOI：
10.1016/j.chempr.2021.03.022
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发表时间：
2021-07-08
期刊：
影响因子：
23.5
通讯作者：
Duan, Xiangfeng
中科院分区：
文献类型：
--
作者：
Lin, Zhaoyang;Wan, Zhong;Duan, Xiangfeng
高纯度单层膜的可扩展制备对于在不同技术中实际集成二维（2D）半导体至关重要，但仍然是一个持续的挑战。先前通过有机铵插层剥离2D层状晶体的努力通常产生少层纳米片，这是由于阻碍相邻层中的完全插层的自延迟效应。在本文中，我们报道了一种独特的“嵌入和分离”化学，其具有恒定的自更新晶体表面，其减轻了自延迟效应以确保体晶体的完全嵌入，最终能够以优异的纯度（例如，对于In 2Se 3和InSe，单层纯度>95%）。此外，我们已经组装了大面积的有机/无机混合超晶格与不同的有机分子和无机2D单层晶体，从而创造了一个家庭的人工超晶格材料与原子调制的化学成分，广泛可调的超晶格周期性，特别是可定制的电子和热性能。
The scalable preparation of high-purity monolayers is essential for practically integrating two-dimensional (2D) semiconductors in diverse technologies but remains a persistent challenge. Previous efforts to exfoliate 2D layered crystals by the organic ammonium intercalation usually produce few-layer nanosheets owing to a self-retarding effect that hinders the complete intercalation in neighboring layers. Herein, we report a unique "intercalation and separation'' chemistry with a constant self-refreshing crystal surface that mitigates the self-retarding effect to ensure a complete intercalation of the bulk crystal, ultimately enabling high-yield solution-phase exfoliation of 2D semiconductor monolayers in excellent purity (e.g., monolayer purity of >95% for In2Se3 and InSe). Furthermore, we have assembled large-area organic/inorganic hybrid superlattices with diverse organic molecules and inorganic 2D monolayer crystals, thus creating a family of artificial superlattice materials with atomically modulated chemical compositions, widely tunable superlattice periodicities, and specifically tailorable electronic and thermal properties.