title: Atomic Resolution Imaging of Halide Perovskites.
abstract: The radiation-sensitive nature of halide perovskites has hindered structural studies at the atomic scale. We overcome this obstacle by applying low dose-rate in-line holography, which combines aberration-corrected high-resolution transmission electron microscopy with exit-wave reconstruction. This technique successfully yields the genuine atomic structure of ultrathin two-dimensional CsPbBr3halide perovskites, and a quantitative structure determination was achieved atom column by atom column using the phase information of the reconstructed exit-wave function without causing electron beam-induced sample alterations. An extraordinarily high image quality enables an unambiguous structural analysis of coexisting high-temperature and low-temperature phases of CsPbBr3in single particles. On a broader level, our approach offers unprecedented opportunities to better understand halide perovskites at the atomic level as well as other radiation-sensitive materials.
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Dandan
authors.initials: D
authors.lastname: Zhang
authors.forename: Christian
authors.initials: C
authors.lastname: Kisielowski
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Letian
authors.initials: L
authors.lastname: Dou
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Nikolay
authors.initials: N
authors.lastname: Kornienko
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Yehonadav
authors.initials: Y
authors.lastname: Bekenstein
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Andrew B
authors.initials: AB
authors.lastname: Wong
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.|Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: A Paul
authors.initials: AP
authors.lastname: Alivisatos
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.|Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Peidong
authors.initials: P
authors.lastname: Yang
keywords: Atomic resolution; halide perovskites; in-line holography; low dose-rate; radiation-sensitive materials