Molybdenum Disulfide Nanoribbons with Enhanced Edge Nonlinear Response and Photoresponsivity

Ganesh Ghimire, Rajesh Ulaganathan, Agnes Tempez, Oleksii Ilchenko, Raymond Unocic, Julian Heske, Denys Igorevich Miakota, Xiang Cheng, Marc Chaigneau, Tim Booth, Peter Bøggild, Kristian Sommer Thygesen, David B. Geohegan, Stela Canulescu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

MoS2 nanoribbons have attracted an increased interest due to their properties, which can be tailored by tuning their dimensions. Herein, we demonstrate the growth of MoSnanoribbons and 3D triangular crystals formed by the reaction between ultra-thin films of MoO3 grown by Pulsed Laser Deposition and NaF in a sulfur-rich environment. The multilayer nanoribbons can reach up to 10 µm in length, and feature single-layer edges, forming a monolayer-multilayer MoS2 junction enabled by the lateral modulation in thickness. The single-layer edges of the nanoribbons show a pronounced second harmonic generation due to the symmetry breaking, in contrast to the centrosymmetric multilayer structure, which is unsusceptible to the second-order nonlinear process. A pronounced splitting of the Raman spectra was observed in MoS2 nanoribbons arising from distinct contributions from the monolayer edges and multilayer core. Nanoscale imaging reveals a blue-shifted exciton emission of the monolayer edge compared to the triangular MoS2 monolayers due to built-in local strain and disorder. We further report on an ultrasensitive photodetector made of a single MoS2 nanoribbon with a responsivity of 8.72×102 A/W at 532 nm, which is among the highest reported up-todate for single-nanoribbon photodetectors. Our findings can inspire the design of MoSsemiconductors with tunable geometries for efficient optoelectronic devices.
Original languageEnglish
Article number2302469
JournalAdvanced Materials
Volume35
Issue number31
Number of pages11
ISSN0935-9648
DOIs
Publication statusPublished - 2023

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