Localized exciton emission from monolayer WS2 nanoribbon at cryogenic temperature

Qiang, Gang; Saunders, Ashley P.; Trinh, Cong Tai; Liu, Na; Jones, Andrew Crandall; Liu, Fang; Htoon, Han

doi:10.1515/nanoph-2024-0583

Localized exciton emission from monolayer WS₂ nanoribbon at cryogenic temperature

Journal Article · Tue Jan 07 00:00:00 EST 2025 · Nanophotonics (Online)

DOI:https://doi.org/10.1515/nanoph-2024-0583· OSTI ID:2496782

^[1]; Saunders, Ashley P. ^[2]; ^[1]; ^[1]; ^[1]; Liu, Fang ^[2]; ^[1]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Stanford Univ., CA (United States)

We conducted low-temperature photoluminescence (PL) spectroscopy experiments on individual WS₂ and MoSe₂ nanoribbons prepared by gold-assisted exfoliation from the slanted surface of bulk crystals with a vicinal and stepwise pattern. The nanoribbons are predominantly monolayer and have widths varying from hundreds of nanometers down to tens of nanometers. Most MoSe₂ NRs display an emission profile similar to 2D excitons of MoSe₂ monolayers. In contrast, WS₂ nanoribbons are characterized with sharp emission peaks that can be attributed to the emission from localized excitons or trions. Moreover a broad low energy emission peak can be also observed from some of the WS₂ nanoribbons, which originates from bilayer regions. In this manuscript, we analyze spectral diffusion behavior along with pump power and temperature dependence of the localized exciton emission peaks, shedding light on potential of TMDC nanoribbons in sensing and opto-electronic applications.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Defense Advanced Research Projects Agency (DARPA); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: 89233218CNA000001

Other Award/Contract Number:: HR00112390108
202363ER

OSTI ID:: 2496782

Alternate ID(s):: OSTI ID: 3020253

Report Number(s):: LA-UR--24-31788; 10.1515/nanoph-2024-0583

Journal Information:: Nanophotonics (Online), Journal Name: Nanophotonics (Online) Journal Issue: 11 Vol. 14; ISSN 2192-8614

Publisher:: de GruyterCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Localized exciton emission from monolayer WS2 nanoribbon at cryogenic temperature

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Localized exciton emission from monolayer WS₂ nanoribbon at cryogenic temperature