Energy Transfer in Mixed-Dimensional Perovskite Heterostructures

Continued advancements in the synthesis and application of nanomaterials dictate the need for well-developed analysis frameworks that fully capture the fundamentals behind their interactions. Förster theory accurately describes the transfer of excitons between molecules. However, this framework has repeatedly failed to quantitatively predict energy transfer rates between semiconducting nanomaterials, particularly in heterostructure systems that combine nanomaterials of different composition and dimensionality. The shortcomings of Förster theory are exacerbated in the case of lead halide perovskites, offering an optimal platform for pushing past the limits of current energy transfer models. Here, we synthesize mixed-dimensional perovskite heterostructures and study energy transfer in these systems using time-resolved photoluminescence spectroscopy. We focus on heterostructures combining spheroidal CsPbBr₃ quantum dots and two- and three-dimensional hybrid organic-inorganic perovskite crystals, and aim to contribute to a deeper, quantitative understanding of energy transfer mechanisms in novel nanomaterials, which will inform the design of optoelectronic devices with nanomaterial interfaces.