Interlayer exciton emission in a MoS₂/VOPc inorganic/organic van der Waals heterostructure

Abstract

Heterostructures built from two-dimensional (2D) materials and organic semiconductors offer a unique platform for addressing many fundamental physics and construction of functional devices by taking both the advantages of 2D...

Long-Range Hot Charge Transfer Exciton Dissociation in an Organic/2D Semiconductor Hybrid Excitonic Heterostructure

“…The prominent MoS 2 PL peak is significantly quenched in the HS without any signature of interlayer exciton emission at a lower energy. We note that Kong et al previously observed a new PL peak at 805 nm in the CVD-grown MoS 2 /VOPc HS and attributed this to interlayer emission from the midgap state at the interface . We did not observe any signature of interlayer exciton emission in the VOPc/MoS 2 HS prepared from mechanical exfoliation here.…”

Strong quenching of dye fluorescence in monomeric perylene orange/TMDC hybrid structures

“…Yet, we cannot distinguish unambiguously between charge and energy transfer as the dominant contribution to the fluorescence quenching. Nevertheless, as charge transfer is generally observed in type II band alignments, 27–33 we favor this interpretation. Even if energy transfer would outcompete hole transfer from the molecular into the semiconductor layer, a consecutive back-transfer of electrons is expected in PO/WSe 2 hybrids, resulting in charge separation after all.…”

“…The charge transfer is typically followed by thermal relaxation of the hot charge carriers or interlayer excitons, even spin ips and the formation of triplet excitons may occur. [29][30][31][32] While these studies mostly focus on nanometer lms of electron-donating metal phtalocyanine molecules [30][31][32][33] on MoS 2 , investigations with purely organic dyes such as the electronaccepting PDIs were conducted in wet media. 21,34 In this work, however, we create hybrid structures by vapor depositing monomeric dye molecules of the PDI N,N ′ -bis(2,6diisopropylphenyl)-3,4,9,10-perylenetetracarboxylic diimide, commonly referred to as perylene orange (PO).…”

van der Waals 2D transition metal dichalcogenide/organic hybridized heterostructures: recent breakthroughs and emerging prospects of the device

“…Furthermore, various TMDO heterostructures showcase improved optical and electrical performance when compared to individual TMD layers or organic entities. 13,14 From an application perspective, both 2D-TMDs and organic semiconductors are in high demand for the development of next-generation flexible and wearable electronics, chemical/biological sensors, detectors, displays, and related technologies. The combination of the efficient light absorption capabilities of organics with the high carrier mobility of inorganics holds the potential to enable cost-effective and efficient optoelectronic devices.…”

“…Similarly, this p-n junction and ILX emission concept is also applicable for other TMD/organic semiconductors. 13,18,19 Again, for lasing, giant PL emission enhancement type I is needed. 14,20 Moreover, these heterostructures find application in electronic and optoelectronic devices including field-effect transistors (FETs) and photodetectors.…”