Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session A63: Structure and Crystallography of Halide Perovskites
8:00 AM–11:00 AM,
Monday, March 2, 2020
Room: Mile High Ballroom 4D
Sponsoring Unit: DMP
Chair: Luisa Whittaker-Brooks
Abstract: A63.00008 : Particle Ordering and A-site Composition Effects in Hybrid Organic-Inorganic Metal Halide Perovskite Quantum Dot Films
(SLAC National Accelerator Laboratory)
(National Renewable Energy Laboratory)
Herein, we report on structural studies of FAxCs1–xPbI3 (FA = formamidinium) QD films by synchrotron X-ray scattering techniques. 15-nm FAxCs1–xPbI3 QDs (x = 0, 0.1, 0.25, 0.5, 0.75, 1) were deposited from colloidal solution and investigated by grazing incidence wide-angle X-ray scattering (GIWAXS). GIWAXS patterns indicate coherent particle ordering on the substrate for thin spin-coated films, while the subsequent ligand exchange and particle depositions lead to isotropic ordering of the particles. The patterns also show evidence of crystallographic phase inhomogeneities and a transition from cubic (FAPbI3) to tetragonal (Cs0.5FA0.5PbI3) to orthorhombic (CsPbI3) character in the composition series.
 A. Hazarika, et al., ACS Nano 2018, 12, 10327.
 A. Swarnkar, et al., Science 2016, 354, 92.
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