{"database":"biostudies-literature","file_versions":[],"scores":{"citationCount":0,"reanalysisCount":0,"viewCount":45,"searchCount":0},"additional":{"submitter":["Baldwin A"],"funding":["European Research Council","Royal Society","Engineering and Physical Sciences Research Council"],"pagination":["4003-4011"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC8154849"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["12(16)"],"pubmed_abstract":["Halide perovskites are versatile semiconductors with applications including photovoltaics and light-emitting devices, having modular optoelectronic properties realizable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites are particularly interesting due to their unique 2D character and charge carrier dynamics. However, long-range energy transport through exciton diffusion in these materials is not understood or realized. Here, local time-resolved luminescence mapping techniques are employed to visualize exciton transport in exfoliated flakes of the BA<sub>2</sub>MA<sub><i>n</i>-1</sub>Pb<sub><i>n</i></sub>I<sub>3<i>n</i>+1</sub> perovskite family. Two distinct transport regimes are uncovered, depending on the temperature range. Above 100 K, diffusion is mediated by thermally activated hopping processes between localized states. At lower temperatures, a nonuniform energy landscape emerges in which transport is dominated by downhill energy transfer to lower-energy states, leading to long-range transport over hundreds of nanometers. Efficient, long-range, and switchable downhill transfer offers exciting possibilities for controlled directional long-range transport in these 2D materials for new applications."],"journal":["The journal of physical chemistry letters"],"pubmed_title":["Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors."],"pmcid":["PMC8154849"],"funding_grant_id":["756962","UF150033","EP/R023980/1","NF170533"],"pubmed_authors":["Galkowski K","Chahbazian R","Delport G","Stranks SD","Baldwin A","Loh KP","Leng K"],"view_count":["45"],"additional_accession":[]},"is_claimable":false,"name":"Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors.","description":"Halide perovskites are versatile semiconductors with applications including photovoltaics and light-emitting devices, having modular optoelectronic properties realizable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites are particularly interesting due to their unique 2D character and charge carrier dynamics. However, long-range energy transport through exciton diffusion in these materials is not understood or realized. Here, local time-resolved luminescence mapping techniques are employed to visualize exciton transport in exfoliated flakes of the BA<sub>2</sub>MA<sub><i>n</i>-1</sub>Pb<sub><i>n</i></sub>I<sub>3<i>n</i>+1</sub> perovskite family. Two distinct transport regimes are uncovered, depending on the temperature range. Above 100 K, diffusion is mediated by thermally activated hopping processes between localized states. At lower temperatures, a nonuniform energy landscape emerges in which transport is dominated by downhill energy transfer to lower-energy states, leading to long-range transport over hundreds of nanometers. Efficient, long-range, and switchable downhill transfer offers exciting possibilities for controlled directional long-range transport in these 2D materials for new applications.","dates":{"release":"2021-01-01T00:00:00Z","publication":"2021 Apr","modification":"2024-11-12T19:42:29.621Z","creation":"2022-02-10T12:17:17.25Z"},"accession":"S-EPMC8154849","cross_references":{"pubmed":["33877840"],"doi":["10.1021/acs.jpclett.1c00823"]}}