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

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

doi:10.1021/acsnano.1c10082

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

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

Functional Hybrid Nanomaterials

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	4197-4205
Number of pages	9
Journal	ACS Nano
Volume	16
Issue number	3
DOIs	https://doi.org/10.1021/acsnano.1c10082
State	Published - Mar 22 2022

Funding

The ultrafast laser spectroscopy and PL measurements were supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award DE-SC0020995 and conducted at The University of Kansas. T.Z. and Z.H.N. were supported by National Nature Science Foundation of China (61927808). The synthesis efforts and electron microscopy were supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, and conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering	DE-SC0020995
National Natural Science Foundation of China	61927808

Keywords

Janus structure
charge transfer
interlayer exciton
transient absorption
transition metal dichalcogenide
van der Waals heterostructure

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10.1021/acsnano.1c10082

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abstract = "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.",

keywords = "Janus structure, charge transfer, interlayer exciton, transient absorption, transition metal dichalcogenide, van der Waals heterostructure",

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AU - Zheng, Ting

AU - Lin, Yu Chuan

AU - Rafizadeh, Neema

AU - Geohegan, David B.

AU - Ni, Zhenhua

AU - Xiao, Kai

AU - Zhao, Hui

PY - 2022/3/22

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N2 - 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.

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

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