Optoelectronic crystal of artificial atoms in strain-textured molybdenum disulphide.

Abstract:

:The isolation of the two-dimensional semiconductor molybdenum disulphide introduced a new optically active material possessing a band gap that can be facilely tuned via elastic strain. As an atomically thin membrane with exceptional strength, monolayer molybdenum disulphide subjected to biaxial strain can embed wide band gap variations overlapping the visible light spectrum, with calculations showing the modified electronic potential emanating from point-induced tensile strain perturbations mimics the Coulomb potential in a mesoscopic atom. Here we realize and confirm this 'artificial atom' concept via capillary-pressure-induced nanoindentation of monolayer molybdenum disulphide from a tailored nanopattern, and demonstrate that a synthetic superlattice of these building blocks forms an optoelectronic crystal capable of broadband light absorption and efficient funnelling of photogenerated excitons to points of maximum strain at the artificial-atom nuclei. Such two-dimensional semiconductors with spatially textured band gaps represent a new class of materials, which may find applications in next-generation optoelectronics or photovoltaics.

journal_name

Nat Commun

journal_title

Nature communications

authors

Li H,Contryman AW,Qian X,Ardakani SM,Gong Y,Wang X,Weisse JM,Lee CH,Zhao J,Ajayan PM,Li J,Manoharan HC,Zheng X

doi

10.1038/ncomms8381

subject

Has Abstract

pub_date

2015-06-19 00:00:00

pages

7381

issn

2041-1723

pii

ncomms8381

journal_volume

6

pub_type

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