Ultrafast and Highly Mobile Photocarriers in Monolayer WSe2 Doped by α-RuCl3

Zheng, Ting; Low, Emma; Rafizadeh, Neema; Burch, Kenneth S.; Zhao, Hui

doi:10.1021/acs.nanolett.5c00369

Ultrafast and Highly Mobile Photocarriers in Monolayer WSe₂ Doped by α-RuCl₃

Journal Article · Wed Feb 26 00:00:00 EST 2025 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5c00369· OSTI ID:2551843

^[1]; Low, Emma ^[2]; Rafizadeh, Neema ^[3]; ^[2]; ^[3]

Southeast University, Nanjing (China); University of Kansas, Lawrence, KS (United States); The University of Kansas
Boston College, Chestnut Hill, MA (United States)
University of Kansas, Lawrence, KS (United States)

We report an experimental investigation of photocarrier dynamics in a heterostructure formed by a WSe₂ monolayer stacked on a multilayer α-RuCl₃ flake. The samples were fabricated using mechanical exfoliation and dry transfer techniques. Photoluminescence measurements showed that the excitonic photoluminescence of WSe₂ is quenched by more than 3 orders of magnitude upon contact with α-RuCl₃. 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 cm² s^–1, which is higher than the exciton diffusion coefficients of most previously studied 2D semiconductors. Furthermore, these results suggest that α-RuCl₃-doped WSe₂ could be utilized in high-speed optoelectronic devices.

View Accepted Manuscript (DOE)

Research Organization:: University of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0018675; SC0020995

OSTI ID:: 2551843

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 10 Vol. 25; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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