Black phosphorus (BP) exhibits thickness‐dependent band gap and high electronic mobility. The chemical intercalation of BP with alkali metal has attracted attention recently due to the generation of universal superconductivity regardless of the type of alkali metals. However, both ultrathin BP, as well as alkali metal‐intercalated BP, are highly unstable and corrode rapidly under ambient conditions. This study demonstrates that alkali metal hydride intercalation decouples monolayer to few layers BP from the bulk BP, allowing an optical gap of ≈1.7 eV and an electronic gap of 1.98 eV to be measured by photoluminescence and electron energy loss spectroscopy at the intercalated regions. Raman and transport measurements confirm that chemically intercalated BP exhibits enhanced stability, while maintaining a high hole mobility of up to ≈800 cm² V⁻¹ s⁻¹ and on/off ratio exceeding 10³. The use of alkali metal hydrides as intercalants should be applicable to a wide range of layered 2D materials and pave the way for generating highly stable, quasi‐monolayer 2D materials.

中文翻译：

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具有高迁移率和空气稳定性的准单层黑磷

黑磷（BP）具有取决于厚度的带隙和高电子迁移率。BP与碱金属的化学插入最近引起了关注，这是因为无论碱金属的类型如何，通用超导的产生。但是，超薄BP和碱金属嵌入的BP都非常不稳定，并且在环境条件下会迅速腐蚀。这项研究表明，碱金属氢化物插层将单层从本体BP分离到几层BP，从而可以通过插层区域的光致发光和电子能量损失光谱法测量到≈1.7eV的光学间隙和1.98 eV的电子间隙。拉曼和运输测量结果证实，化学插层的BP表现出增强的稳定性，同时保持了高达≈800cm的高空穴迁移率² V ^-1 s ^-1和开/关比超过10 ³。使用碱金属氢化物作为嵌入剂应适用于各种分层的2D材料，并为生成高度稳定的准单层2D材料铺平了道路。