Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session TT08: V: Complex Structured Materials, Including Graphene III
3:30 PM–5:30 PM,
Tuesday, March 21, 2023
Room: Virtual Room 8
Sponsoring
Unit:
DCMP
Chair: Dacen Waters, University of Washington
Abstract: TT08.00003 : Engineering photoluminescence using strain in two-dimensional transition-metal dichalcogenides*
3:54 PM–4:06 PM
Presenter:
ANUJ K SINGH
(IIT Bombay)
Authors:
ANUJ K SINGH
(IIT Bombay)
Kishor K Mandal
(IIT Bombay)
Brijesh Kumar
(IIT Bombay)
Lekshmi Eswaramoorthy
(IIT Bombay)
ANSHUMAN KUMAR
(Indian Inst of Tech-Bombay)
Collaborations:
Anuj Kumar Singh, Kishor Kumar Mandal, Brijesh Kumar, Lekshmi Eswarmoorthy, Anshuman Kumar
Atomically thin two-dimensional transition metal dichalcogenides have fascinated researchers due to their unique electronic and optical properties. The control of exciton-trion dynamics in two-dimensional semiconductors is critical for their application in optoelectronic devices. One way to engineer the exciton-trion dynamics is by applying strain in the monolayers of these two-dimensional materials using nanostructured substrates. Here we demonstrate a versatile route to engineering the exciton-trion dynamics in monolayer WSe2 by applying biaxial strain. A polytetrafluoroethylene (PTFE) nanocone array decorated by thin gold film and fabricated via colloidal lithography is used to create the strain in the superposed monolayer. To distinguish the effect of strain and plasmonics, we compare our results on the nanocone surface with the one for monolayer WSe2 on a plane gold film.
Atomically thin two-dimensional (2D) semiconductors have received a lot of research attention owing to their high exciton binding energy and strong light-matter interaction. Still, the integration of these 2D semiconductors with nanostructures is required for practical photonics applications owing to their atomically thin nature. Here we present a versatile route to exciton-trion dynamics by producing biaxial strain using gold-decorated nanocone structures fabricated using the colloidal lithography technique. We use polystyrene beads as colloidal particles, and a self-assembled monolayer of these particles was deposited via convective self-assembly over a PTFE substrate. The self-assembled monolayer of these colloidal particles works as a mask, which is subsequently etched using reactive ion etching, which causes the formation of the PTFE nanocone array. A thin layer of gold is deposited on top of these nanocone structures, which creates the dual effect of strain and plasmonic enhancement. Finally, we integrate our CVD-grown monolayer WSe2 with these nanocone structures using a wet transfer method. We demonstrate the strain engineering of exciton-trion dynamics using photoluminescence and Raman spectroscopy. We further compare exciton-trion interconversion due to the funneling effect in strained WSe2 with a control experiment in unstrained WSe2.
*We have institute funding to support students
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