When 2D materials meet molecules: molecular functions in hybrid van der Waals heterostructures
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When 2D materials meet molecules: molecular functions in hybrid van der Waals heterostructures
CIC nanoGUNE Seminars
- Speaker
-
Marco Gobbi, Nanodevices group
- When
-
2018/10/01
13:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
iCal
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Van der Waals heterostructures, composed of vertically stacked inorganic 2D
materials, represent an ideal platform to demonstrate novel device
architectures and to fabricate on-demand materials.[1] The incorporation of
molecules within these systems holds an immense potential, since an almost
infinite variety of molecules can be designed and synthesized with predictable
functionalities.[2] Here, we show how molecular design can be exploited to
modify intrinsic properties and confer new capabilities to 2D materials. In a
first work, we show that programmable 1D periodic potentials take place at the
interface between ordered molecular layers and graphene, which might introduce
anisotropy in the graphene band structure. The amplitude and sign of the
potentials can be modified without altering their periodicity by employing
different molecules. [3] In a second work, we demonstrate how the photo-
responsive nature of molecular switches can be conferred to the charge
transport properties of 2D materials. In particular, photochromic molecules
self-assembled on graphene and MoS2 generate atomically precise superlattices
in which a light-induced structural reorganization enables control over the
local charge carrier density.[4] Accordingly, novel device functionalities are
demonstrated, including the photo-modulation of the threshold voltage in MoS2
and the use of spatially confined light irradiation to define reversible
lateral heterojunctions. These experiments provide a glimpse of the potential
of combining 2D materials with molecular monolayers to build up novel
multifunctional materials with unique properties.