Interlayer exciton landscape in WS₂/tetracene heterostructures

Area of Science:

• Condensed Matter Physics
• Materials Science
• Optoelectronics

Background:

• Vertical stacking of 2D materials into heterostructures yields unique optoelectronic properties.
• Research on transition metal dichalcogenide (TMD) heterostructures is advancing, but TMD/organic molecule interfaces remain underexplored.

Purpose of the Study:

• Investigate the optoelectronic properties of TMD/tetracene heterostructures.
• Characterize the nature and behavior of interlayer excitons in these systems.

Main Methods:

• Joint theoretical and experimental approach.
• Low-temperature photoluminescence spectroscopy.
• Computational modeling of exciton dynamics.

Main Results:

• Observed clear signatures of spatially separated interlayer excitons in TMD/tetracene heterostructures.
• Identified both intra- and interlayer exciton landscapes.
• Demonstrated temperature-dependent intensity transfer from intralayer to interlayer excitons.
• Detected phonon-sidebands associated with interlayer excitons.

Conclusions:

• Shed light on the microscopic nature of interlayer excitons in TMD/molecule heterostructures.
• Findings have potential implications for technological applications in optoelectronics.
• Highlights the importance of exploring organic molecule integration in 2D material heterostructures.