Ultrafast and Highly Mobile Photocarriers in Monolayer WSe<sub>2</sub> Doped by α-RuCl<sub>3</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 40011220.
- Also identified by DOI 10.1021/acs.nanolett.5c00369.
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Abstract
We report an experimental investigation of photocarrier dynamics in a heterostructure formed by a WSe<sub>2</sub> monolayer stacked on a multilayer α-RuCl<sub>3</sub> flake. The samples were fabricated using mechanical exfoliation and dry transfer techniques. Photoluminescence measurements showed that the excitonic photoluminescence of WSe<sub>2</sub> is quenched by more than 3 orders of magnitude upon contact with α-RuCl<sub>3</sub>. Transient absorption measurements revealed an ultrashort photocarrier lifetime of 0.5 ps in the heterostructure. Spatially resolved transient absorption microscopy measurements were employed to probe the transport properties of these photocarriers, resulting in a room-temperature diffusion coefficient of 370 cm<sup>2</sup> s<sup>-1</sup>, which is higher than the exciton diffusion coefficients of most previously studied 2D semiconductors. These results suggest that α-RuCl<sub>3</sub>-doped WSe<sub>2</sub> could be utilized in high-speed optoelectronic devices.