Journal
NANO LETTERS
Volume 17, Issue 9, Pages 5489-5494Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02146
Keywords
Ruddlesden Popper phase; inorganic halide perovskite; aberration-corrected scanning transmission electron microscopy; two-dimensional; domain
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the Physical Chemistry of Inorganic Nanostructures Program [DE-AC02-05-CH11231, KC3103]
- Office of Science, Office of Basic Energy Science, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Suzhou Industrial Park
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A Ruddlesden Popper (RP) type structure is well-known in oxide perovskites and is related to many interesting properties such as superconductivity and ferroelectricity. However, the RP phase has not yet been discovered in inorganic halide perovskites. Here, we report the direct observation of unusual structure in two-dimensional CsPbBr3 nanosheets which could be interpreted as the RP phase based on model simulations. Structural details of the plausible RP domains and domain boundaries between the RP and conventional perovskite phases have been revealed on the atomic level using aberration-corrected scanning transmission electron microscopy. The finding marks a major advance toward future inorganic halide RP phase synthesis and theoretical modeling, as well as unraveling their structure property relationship.
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