title: Three-Dimensional Optical Tomography and Correlated Elemental Analysis of Hybrid Perovskite Microstructures: An Insight into Defect-Related Lattice Distortion and Photoinduced Ion Migration.
abstract: Organic lead halide perovskites have recently been proposed for applications in light-emitting devices of different sorts. More specifically, regular crystalline microstructures constitute an efficient light source and fulfill the geometrical requirements to act as resonators, giving rise to waveguiding and optical amplification. Herein we show three-dimensional laser scanning confocal tomography studies of different types of methylammonium lead bromide microstructures which have allowed us to dissect their photoemission properties with a precision of 0.036 μm3. This analysis shows that their spectral emission presents strong spatial variations which can be attributed to defect-related lattice distortions. It is also largely enhanced under light exposure, which triggers the migration of halide ions away from illuminated regions, eventually leading to a strongly anisotropic degradation. Our work points to the need for performing an optical quality test of individual crystallites prior to their use in optoelectronics devices and provides a means to do so.
authors.affiliation: Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC)- Universidad de Sevilla , C/Américo Vespucio 49, 41092 Sevilla, Spain.
authors.forename: Juan F
authors.initials: JF
authors.lastname: Galisteo-López
authors.affiliation: Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC)- Universidad de Sevilla , C/Américo Vespucio 49, 41092 Sevilla, Spain.
authors.forename: Yuelong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC)- Universidad de Sevilla , C/Américo Vespucio 49, 41092 Sevilla, Spain.
authors.forename: Hernán
authors.identifier: http://orcid.org/0000-0003-2925-6360
authors.initials: H
authors.lastname: Míguez