Interlayer Coupling and Ultrafast Hot Electron Transfer Dynamics in Metallic VSe<sub>2</sub>/Graphene van der Waals Heterostructures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33761743.
- Also identified by DOI 10.1021/acsnano.1c01723.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Atomically thin vanadium diselenide (VSe<sub>2</sub>) is a two-dimensional transition metal dichalcogenide exhibiting attractive properties due to its metallic 1T phase. With the recent development of methods to manufacture high-quality monolayer VSe<sub>2</sub> on van der Waals materials, the outstanding properties of VSe<sub>2</sub>-based heterostructures have been widely studied for diverse applications. Dimensional reduction and interlayer coupling with a van der Waals substrate lead to its distinguishable characteristics from its bulk counterparts. However, only a few fundamental studies have investigated the interlayer coupling effects and hot electron transfer dynamics in VSe<sub>2</sub> heterostructures. In this work, we reveal ultrafast and efficient interlayer hot electron transfer and interlayer coupling effects in VSe<sub>2</sub>/graphene heterostructures. Femtosecond time-resolved reflectivity measurements showed that hot electrons in VSe<sub>2</sub> were transferred to graphene within a 100 fs time scale with high efficiency. Besides, coherent acoustic phonon dynamics indicated interlayer coupling in VSe<sub>2</sub>/graphene heterostructures and efficient thermal energy transfer to three-dimensional substrates. Our results provide valuable insights into the intriguing properties of metallic transition metal dichalcogenide heterostructures and motivate designing optoelectronic and photonic devices with tailored properties.