Efficient and Layer-Dependent Exciton Pumping across Atomically Thin Organic-Inorganic Type-I Heterostructures

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Monolayer transition metal dichalcogenides (TMDs) exhibit unique light-matter interactions.
• Hybridization with organic materials offers a route to engineer TMD properties.

Purpose of the Study:

• To fabricate and characterize atomically thin organic-inorganic (O-I) heterostructures.
• To investigate exciton dynamics and charged exciton binding in these novel heterostructures.

Main Methods:

• Fabrication of heterostructures using monolayer MoSe2 and single-crystal pentacene.
• Characterization of band alignment and exciton pumping efficiency.
• Analysis of dielectric environment effects on charged excitons.

Main Results:

• Demonstrated type-I band alignment in O-I heterostructures.
• Achieved >86 times higher interfacial exciton pumping efficiency compared to MoSe2 photoexcitation.
• Observed significant modulation of charged exciton binding by the organic layer's dielectric environment.

Conclusions:

• Atomically thin O-I heterostructures enable efficient exciton pumping and tunable exciton properties.
• These findings open new possibilities for fundamental studies and optoelectronic devices.