Quantify the separate contributions of strain-modified exciton dynamics and exciton funneling to photoluminescence enhancement

Determine the individual quantitative contributions of strain-modified exciton dynamics and exciton funneling to the enhanced MoSe₂ photoluminescence in monolayer ReS₂/hBN/MoSe₂ heterostructures, beyond their combined contribution to the enhanced interlayer energy-transfer process.

Background

The paper attributes the pronounced MoSe₂ photoluminescence enhancement to an enhanced interlayer energy-transfer process arising from a combination of strain-modified exciton dynamics and exciton funneling. Strain is expected to narrow the transition energies, drive excitons toward the bubble apex, and increase transition dipole moments, while transfer-matrix calculations indicate that optical interference is insufficient to explain the observed enhancement.

Although the measurements establish the combined enhancement, they do not independently resolve how much arises from strain-induced changes in exciton dynamics versus spatial exciton funneling. Separating these effects quantitatively would clarify the mechanism responsible for the enhanced photoluminescence quantum yield.