Efficient Energy Transfer across Organic–2D Inorganic Heterointerfaces

Combining organic and inorganic semiconductors enables us to integrate complementary advantages of each material system into a single hybrid material platform. Here, we report a study on the energy transport across a hybrid interface consisting of j-aggregates of organic dye and monolayer molybdenum disulfide (MoS2). The excellent overlap between the photoluminescence spectra of j-aggregates and the absorption of MoS2 B-exciton enables the material system to be used to study Förster resonance energy transfer (FRET) across the hybrid interface. We report a short Förster radius of 1.88 nm for the hybrid system. We achieve this by fabricating photodetectors based on the hybrid organic–inorganic interface that combine the high absorption of organics with the high-charge mobility of inorganics. Concomitantly, the hybrid photodetectors show nearly 93 ± 5% enhancement of photoresponsivity in the excitonic spectral overlap regime due to efficient energy transfer (ET) from j-aggregate to MoS2. This work not only provides valuable insight into the ET mechanism across such hybrid organic–inorganic interfaces but also demonstrates the feasibility of the platform for designing efficient energy conversion and optoelectronic devices.