Excitonic Dynamics in Janus MoSSe and WSSe Monolayers

Ting Zheng; Yu Chuan Lin; Yiling Yu; Pavel Valencia-Acuna; Alexander A. Puretzky; Riccardo Torsi; Chenze Liu; Ilia N. Ivanov; Gerd Duscher; David B. Geohegan; Zhenhua Ni; Kai Xiao; Hui Zhao

doi:10.1021/acs.nanolett.0c03412

Excitonic Dynamics in Janus MoSSe and WSSe Monolayers

Ting Zheng, Yu Chuan Lin, Yiling Yu, Pavel Valencia-Acuna, Alexander A. Puretzky, Riccardo Torsi, Chenze Liu, Ilia N. Ivanov, Gerd Duscher, David B. Geohegan, Zhenhua Ni, Kai Xiao, Hui Zhao

Functional Hybrid Nanomaterials

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

109 Scopus citations

Abstract

We report here details of steady-state and time-resolved spectroscopy of excitonic dynamics for Janus transition metal dichalcogenide monolayers, including MoSSe and WSSe, which were synthesized by low-energy implantation of Se into transition metal disulfides. Absorbance and photoluminescence spectroscopic measurements determined the room-temperature exciton resonances for MoSSe and WSSe monolayers. Transient absorption measurements revealed that the excitons in Janus structures form faster than those in pristine transition metal dichalcogenides by about 30% due to their enhanced electron-phonon interaction by the built-in dipole moment. By combining steady-state photoluminescence quantum yield and time-resolved transient absorption measurements, we find that the exciton radiative recombination lifetime in Janus structures is significantly longer than in their pristine samples, supporting the predicted spatial separation of the electron and hole wave functions due to the built-in dipole moment. These results provide fundamental insight in the optical properties of Janus transition metal dichalcogenides.

Original language	English
Pages (from-to)	931-937
Number of pages	7
Journal	Nano Letters
Volume	21
Issue number	2
DOIs	https://doi.org/10.1021/acs.nanolett.0c03412
State	Published - Jan 27 2021

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
exciton
transient absorption
transition metal dichalcogenide
two-dimensional material

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10.1021/acs.nanolett.0c03412

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title = "Excitonic Dynamics in Janus MoSSe and WSSe Monolayers",

abstract = "We report here details of steady-state and time-resolved spectroscopy of excitonic dynamics for Janus transition metal dichalcogenide monolayers, including MoSSe and WSSe, which were synthesized by low-energy implantation of Se into transition metal disulfides. Absorbance and photoluminescence spectroscopic measurements determined the room-temperature exciton resonances for MoSSe and WSSe monolayers. Transient absorption measurements revealed that the excitons in Janus structures form faster than those in pristine transition metal dichalcogenides by about 30% due to their enhanced electron-phonon interaction by the built-in dipole moment. By combining steady-state photoluminescence quantum yield and time-resolved transient absorption measurements, we find that the exciton radiative recombination lifetime in Janus structures is significantly longer than in their pristine samples, supporting the predicted spatial separation of the electron and hole wave functions due to the built-in dipole moment. These results provide fundamental insight in the optical properties of Janus transition metal dichalcogenides.",

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doi = "10.1021/acs.nanolett.0c03412",

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AU - Zheng, Ting

AU - Lin, Yu Chuan

AU - Yu, Yiling

AU - Valencia-Acuna, Pavel

AU - Puretzky, Alexander A.

AU - Torsi, Riccardo

AU - Liu, Chenze

AU - Ivanov, Ilia N.

AU - Duscher, Gerd

AU - Geohegan, David B.

AU - Ni, Zhenhua

AU - Xiao, Kai

AU - Zhao, Hui

PY - 2021/1/27

Y1 - 2021/1/27

N2 - We report here details of steady-state and time-resolved spectroscopy of excitonic dynamics for Janus transition metal dichalcogenide monolayers, including MoSSe and WSSe, which were synthesized by low-energy implantation of Se into transition metal disulfides. Absorbance and photoluminescence spectroscopic measurements determined the room-temperature exciton resonances for MoSSe and WSSe monolayers. Transient absorption measurements revealed that the excitons in Janus structures form faster than those in pristine transition metal dichalcogenides by about 30% due to their enhanced electron-phonon interaction by the built-in dipole moment. By combining steady-state photoluminescence quantum yield and time-resolved transient absorption measurements, we find that the exciton radiative recombination lifetime in Janus structures is significantly longer than in their pristine samples, supporting the predicted spatial separation of the electron and hole wave functions due to the built-in dipole moment. These results provide fundamental insight in the optical properties of Janus transition metal dichalcogenides.

AB - We report here details of steady-state and time-resolved spectroscopy of excitonic dynamics for Janus transition metal dichalcogenide monolayers, including MoSSe and WSSe, which were synthesized by low-energy implantation of Se into transition metal disulfides. Absorbance and photoluminescence spectroscopic measurements determined the room-temperature exciton resonances for MoSSe and WSSe monolayers. Transient absorption measurements revealed that the excitons in Janus structures form faster than those in pristine transition metal dichalcogenides by about 30% due to their enhanced electron-phonon interaction by the built-in dipole moment. By combining steady-state photoluminescence quantum yield and time-resolved transient absorption measurements, we find that the exciton radiative recombination lifetime in Janus structures is significantly longer than in their pristine samples, supporting the predicted spatial separation of the electron and hole wave functions due to the built-in dipole moment. These results provide fundamental insight in the optical properties of Janus transition metal dichalcogenides.

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KW - two-dimensional material

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Excitonic Dynamics in Janus MoSSe and WSSe Monolayers

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