Energy Funneling in a Noninteger Two-Dimensional Perovskite.

Autor: Oddo AM; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Gao M; Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Weinberg D; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Jin J; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States., Folgueras MC; Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.; Kavli Energy NanoScience Institute, Berkeley, California 94720, United States., Song C; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Ophus C; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Mani T; Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States., Rabani E; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.; The Raymond and Beverly Sackler Center of Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel., Yang P; Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.; Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.; Kavli Energy NanoScience Institute, Berkeley, California 94720, United States.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2023 Dec 27; Vol. 23 (24), pp. 11469-11476. Date of Electronic Publication: 2023 Dec 07.
DOI: 10.1021/acs.nanolett.3c03058
Abstrakt: Energy funneling is a phenomenon that has been exploited in optoelectronic devices based on low-dimensional materials to improve their performance. Here, we introduce a new class of two-dimensional semiconductor, characterized by multiple regions of varying thickness in a single confined nanostructure with homogeneous composition. This "noninteger 2D semiconductor" was prepared via the structural transformation of two-octahedron-layer-thick ( n = 2) 2D cesium lead bromide perovskite nanosheets; it consisted of a central n = 2 region surrounded by edge-lying n = 3 regions, as imaged by electron microscopy. Thicker noninteger 2D CsPbBr 3 nanostructures were obtained as well. These noninteger 2D perovskites formed a laterally coupled quantum well band alignment with virtually no strain at the interface and no dielectric barrier, across which unprecedented intramaterial funneling of the photoexcitation energy was observed from the thin to the thick regions using time-resolved absorption and photoluminescence spectroscopy.
Databáze: MEDLINE
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