Reaching the Excitonic Limit in 2D Janus Monolayers by In Situ Deterministic Growth
Reaching the Excitonic Limit in 2D Janus Monolayers by In Situ Deterministic Growth
复制标题
通过原位确定性生长达到二维 Janus 单层的激子极限
DOI：
10.1002/adma.202106222
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发表时间：
2021
影响因子：
29.4
通讯作者：
Yang, Shize
中科院分区：
文献类型：
--
作者：
Qin, Ying;Sayyad, Mohammed;Montblanch, Alejandro R. ‐P.;Feuer, Matthew S. G.;Dey, Dibyendu;Blei, Mark;Sailus, Renee;Kara, Dhiren M.;Shen, Yuxia;Yang, Shize
过渡金属二硫属化物（TMD）Janus单分子膜以双面罗马过渡之神的名字命名，具有两个不同的硫属表面，本质上打破了平面外镜像对称。镜像对称性的破缺和由此产生的势梯度导致了量子特性的出现，如拉什巴效应和偶极激子的形成。然而，对这些量子特性的实验访问取决于产生高质量2D Janus单层的能力。在这里，这些结果引入了一种整体2D Janus合成技术，可以对生长过程进行真实的实时监控。该原型室集成了原位光谱学，提供了对结构演变和生长动力学的基本见解，从而可以评估和优化Janus单层的质量。通过合成和监测SWSe、SNbSe和SMoSe Janus单层膜的转化证明了该方法的多功能性。确定性转换和真实的-时间数据收集进一步帮助将剥离的TMD转换为Janus单层，并且与当前最佳标准相比，达到了无与伦比的激子线宽值。结果提供了一个深入了解的过程动力学和援助的发展新的Janus单分子膜具有高的光学质量，这是非常需要访问其异国情调的属性。
Named after the two‐faced Roman god of transitions, transition metal dichalcogenide (TMD) Janus monolayers have two different chalcogen surfaces, inherently breaking the out‐of‐plane mirror symmetry. The broken mirror symmetry and the resulting potential gradient lead to the emergence of quantum properties such as the Rashba effect and the formation of dipolar excitons. Experimental access to these quantum properties, however, hinges on the ability to produce high‐quality 2D Janus monolayers. Here, these results introduce a holistic 2D Janus synthesis technique that allows real‐time monitoring of the growth process. This prototype chamber integrates in situ spectroscopy, offering fundamental insights into the structural evolution and growth kinetics, that allow the evaluation and optimization of the quality of Janus monolayers. The versatility of this method is demonstrated by synthesizing and monitoring the conversion of SWSe, SNbSe, and SMoSe Janus monolayers. Deterministic conversion and real‐time data collection further aid in conversion of exfoliated TMDs to Janus monolayers and unparalleled exciton linewidth values are reached, compared to the current best standard. The results offer an insight into the process kinetics and aid in the development of new Janus monolayers with high optical quality, which is much needed to access their exotic properties.