光致发光
范德瓦尔斯力
材料科学
静水压力
凝聚态物理
密度泛函理论
拉曼光谱
激子
光电子学
化学
光学
物理
计算化学
分子
热力学
有机化学
作者
Joon‐Seok Kim,Nikhilesh Maity,Myung-Soo Kim,Suyu Fu,Rinkle Juneja,Abhishek K. Singh,Deji Akinwande,Jung‐Fu Lin
出处
期刊:Cornell University - arXiv
日期:2021-08-30
标识
DOI:10.48550/arxiv.2108.13573
摘要
Excitonic properties in 2D heterobilayers are closely governed by charge transfer (CT) and excitonic energy transfer (ET) at van der Waals interfaces. Various means have been employed to modulate the interlayer CT and ET, including electrical gating and modifying interlayer spacing, but with limited extent in their controllability. Here, we report a novel method to modulate these transfers in MoS2/WS2 heterobilayer by applying compressive strain under hydrostatic pressure. Raman and photoluminescence measurements, combined with density functional theory calculations show pressure-enhanced interlayer interaction of the heterobilayer. Photoluminescence enhancement factor {\eta} of WS2 in heterobilayer decreases by five times up to ~4 GPa, suggesting a strong ET, whereas it increases by an order of magnitude at higher pressures and reaches almost unity, indicating enhanced CT. Theoretical calculations show that orbital switching in the conduction bands is responsible for the modulation of the transfers. Our findings provide a compelling approach towards effective mechanical control of CT and ET in 2D excitonic devices.
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