Janus Monolayers for Ultrafast and Directional Charge Transfer in Transition Metal Dichalcogenide Heterostructures

Zheng, Ting; Lin, Yu-Chuan; Rafizadeh, Neema; Geohegan, David B.; Ni, Zhenhua; Xiao, Kai; Zhao, Hui

doi:10.1021/acsnano.1c10082

Title: Janus Monolayers for Ultrafast and Directional Charge Transfer in Transition Metal Dichalcogenide Heterostructures

Journal Article · Wed Mar 02 00:00:00 EST 2022 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.1c10082· OSTI ID:1862114

Zheng, Ting ^[1];

^[2]; Rafizadeh, Neema ^[3];

^[4];

^[5];

^[4];

^[3]

Southeast Univ., Nanjing (China); Univ. of Kansas, Lawrence, KS (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Pennsylvania State Univ., University Park, PA (United States)
Univ. of Kansas, Lawrence, KS (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Southeast Univ., Nanjing (China)

Charge transfer properties of van der Waals heterostructures formed by Janus and regular transition metal dichalcogenide monolayers are studied by time-resolved pump–probe measurements and photoluminescence spectroscopy. Measurements of electron and hole transfer in three heterostructures with atomic layer sequences of S–W–Se/S–W–S, Se–W–S/S–W–S, and S–W–Se/Se–W–Se reveal that charge transfer from regular to Janus monolayers is ultrafast regardless of the direction of the built-in electric field of the Janus monolayer (Janus field). However, the charge transfer from Janus to regular layers is directional and controlled by the Janus field. When the current direction is along the field, the charge transfer is ultrafast and efficient, while the field blocks the charge transfer with an opposite charge current direction. The transferred carriers form interlayer excitons with extended lifetimes compared to the intralayer excitons. The demonstrated ultrafast and directional charge transfer between Janus and regular TMD layers shows that the Janus structures can be used to make 2D heterostructures with efficient and directional charge transfer properties.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC)

Contributing Organization:: Southeast University, China; Oak Ridge National Laboratory (ORNL)

Grant/Contract Number:: AC05-00OR22725; SC0020995

OSTI ID:: 1862114

Alternate ID(s):: OSTI ID: 1864708

Journal Information:: ACS Nano, Vol. 16, Issue 3; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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