通过引入可控界面应力实现对单层WS2与衬底的界面耦合的监控与调控
Monitoring and engineering interface coupling between monolayer WS2 and substrate through controllably introducing interfacial strain
岳晓飞 1陈嘉俊 1韩金坤 1单亚兵 1申淑雯 1吴雯萱 1刘炳杰 1李黎嘉 1陈俞 2张荣君 1胡来归 1刘冉 1仇志军 1丛春晓3
作者信息
- 1. School of Information Science and Technology,Fudan University,Shanghai 200433,China
- 2. Commonwealth Scientific and Industrial Research Organization(CSIRO),Clayton,Victoria 3168,Australia
- 3. School of Information Science and Technology,Fudan University,Shanghai 200433,China;Yiwu Research Institute of Fudan University,Yiwu 322000,China
- 折叠
摘要
二维层状材料及其范德华同质/异质结构的界面特性在探索新奇物理现象和优化器件性能方面起着至关重要的作用.尽管二维同质结构和异质结构的界面耦合问题已经引起了人们极大的研究兴趣,然而涉及二维层状材料与衬底之间界面耦合的研究却十分有限,这主要由于在二维层状材料-衬底界面实现直接探测仍存在挑战.目前,二维层状材料与衬底之间的界面耦合机制还存在诸多争议,需要引起更多的重视.本研究中,我们基于高温高真空原位拉曼光谱系统,通过监测单层WS2的低频拉曼振动模式,系统地研究了单层WS2与其支撑衬底之间的界面耦合机制.研究结果表明,界面间距和界面应力对单层WS2与衬底之间的界面耦合强度均有显著影响.更值得注意的是,我们发现引入适当的界面应力能够有效地增强样品与衬底之间的界面耦合强度.因此,通过简单地控制退火的冷却过程,我们成功地实现了对样品-衬底界面耦合的有效调控.我们的研究结果为理解二维层状材料与衬底之间的耦合关系提供了更加深入的见解,对基于二维半导体材料的高性能器件的设计和优化具有重要的指导意义.
Abstract
The interface properties in two-dimensional(2D)layered materials and their van der Waals(vdW)homo-/heterostructures are of importance in both uncovering novel physical phenomena and optimizing device performance.Despite considerable research interest and enthusiasm direct toward the interlayer coupling in 2D homo-and hetero-structures,there is limited research on the coupling at the 2D layered material-substrate interface.This limitation is due to the challenges in achieving direct detection.Currently,the coupling mechanisms at the 2D layered material-substrate interface is ambiguous,which needs greater attention.In this study,we have systematically investigated the interface cou-pling between monolayer WS2 and its supported substrates using high-temperature and high-vacuum in-situ Raman spectroscopy through monitoring the low-frequency Raman mode of monolayer WS2.Our findings reveal that both in-terfacial spacing and strain can significantly affect the cou-pling strength between the monolayer WS2 and the supported substrate.More notably,we found that the strategic in-troduction of appropriate interfacial strain can effectively enhance the interface coupling.Consequently,we have suc-ceeded in achieving effective regulation of the sample-sub-strate coupling via a convenient way of controlling the cooling process during annealing.Our findings contribute to a deeper understanding of the coupling correlation between 2D layered materials and substrates,which is of great significance for the design and optimization of high-performance devices based on 2D layered semiconductors.
关键词
two-dimensional layered material/substrate/interface coupling/low-frequency Raman mode/interfacial spacing/in-terfacial strainKey words
two-dimensional layered material/substrate/interface coupling/low-frequency Raman mode/interfacial spacing/in-terfacial strain引用本文复制引用
基金项目
National Key R&D Program of China(2018YFA0703700)
National Natural Science Foundation of China(62374037)
Shanghai Municipal Natural Science Foundation(20ZR1403200)
National Young 1000 Talent Plan of China()
出版年
2024
NETL
NSTL
万方数据