Journal
ACS ENERGY LETTERS
Volume 5, Issue 5, Pages 1380-1385Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00471
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Funding
- Bavarian State Ministry of Science, Research and Arts through the grant Solar Technologies go Hybrid (SolTech)
- Deutsche Forschungsgemeinsschaft (DFG) under Germany's Excellence Strategy [EXC 2089/1-390776260]
- European Research Council Horizon 2020 through the ERC Grant Agreement PINNACLE [759744]
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Despite showing great promise for optoelectronics, the commercialization of halide perovskite nanostructure-based devices is hampered by inefficient electrical excitation and strong exciton binding energies. While transport of excitons in an energy-tailored system via Forster resonance energy transfer (FRET) could be an efficient alternative, halide ion migration makes the realization of cascaded structures difficult. Here, we show how these could be obtained by exploiting the pronounced quantum confinement effect in two-dimensional CsPbBr3-based nanoplatelets (NPls). In thin films of NPls of two predetermined thicknesses, we observe an enhanced acceptor photoluminescence (PL) emission and a decreased donor PL lifetime. This indicates a FRET-mediated process, benefitted by the structural parameters of the NPls. We determine corresponding transfer rates up to k(FRET) = 0.99 ns(-1) and efficiencies of nearly eta(FRET) = 70%. We also show FRET to occur between perovskite NPls of other thicknesses. Consequently, this strategy could lead to tailored energy cascade nanostructures for improved optoelectronic devices.
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