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Potential modulations in flatland: near-infrared sensitization of MoS2 phototransistors by a solvatochromic dye directly tethered to sulfur vacancies.

Abstract：

:Near-infrared sensitization of monolayer MoS2 is here achieved via the covalent attachment of a novel heteroleptic nickel bis-dithiolene complex into sulfur vacancies in the MoS2 structure. Photocurrent action spectroscopy of the sensitized films reveals a discreet contribution from the sensitizer dye centred around 1300 nm (0.95 eV), well below the bandgap of MoS2 (2.1 eV), corresponding to the excitation of the monoanionic dithiolene complex. A mechanism of conductivity enhancement is proposed based on a photo-induced flattening of the corrugated energy landscape present at sulfur vacancy defect sites within the MoS2 due to a dipole change within the dye molecule upon photoexcitation. This method of sensitization might be readily extended to other functional molecules that can impart a change to the dielectric environment at the MoS2 surface under stimulation, thereby extending the breadth of detector applications for MoS2 and other transition metal dichalcogenides.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Dalgleish S,Reissig L,Shuku Y,Ligorio G,Awaga K,List-Kratochvil EJW

doi

10.1038/s41598-019-53186-2

subject

Has Abstract

pub_date

2019-11-13 00:00:00

pages

16682

issue

1

issn

2045-2322

pii

10.1038/s41598-019-53186-2

journal_volume

9

pub_type

杂志文章

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