Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.214
Publication date: 7th February 2022
Transition metal dichalcogenide (TMDC) is a class of material with a layered structure in bulk with an indirect bandgap, which becomes direct at the K point in momentum space if only a monolayer is present. This bandgap transition leads to a strong light-matter interaction such as enhanced photoluminescence (PL), compared to the bulk. Monolayer sheets of TMDC with large interaction area can easily be coupled to other low dimensional materials such as 0D nanocrystals, 1D nanowires, or other 2D-2D heterostructures. Halide perovskites are a class of materials with a structural formula ABX3 where A and B are cations such as Cs, Pb, etc and X is halogen. Halide perovskites in both bulk and low dimension show excellent photon absorption and emission properties. Due to its large range of visible light absorption, halide perovskites have made their way and have significantly improved in the field of photovoltaics. A heterostructure combination of the two systems (0D-2D) can show new electronic properties. A plethora of options available in these two classes of materials in terms of band offsets and bandgaps can lead to both type I and II systems.
In this contribution, we present the large exciton energy funneling in a 0D-2D heterostructure of CsPbBr3 (di-dodecyl, dimethyl ammonium as ligand) and MoSe2 monolayer. MoSe2 and CsPbBr3 heterostructure form a type I structure with MoSe2 being the lower bandgap material. We use steady-state and time-resolved µ-PL spectroscopy techniques to probe the photo-induced energy transfer between a set of different CsPbBr3 NCs and MoSe2. Spectroscopy results will be discussed in detail in the frame of exciton energy transfer and its efficiency will be compared to literature.
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