Exploring Nanoscale Structure in Perovskite Precursor Solutions Using Neutron and Light Scattering.

Autor: O'Kane ME; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom., Smith JA; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom., Kilbride RC; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom., Spooner ELK; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom., Duif CP; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands., Catley TE; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom., Washington AL; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom., King SM; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom., Parnell SR; Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands., Parnell AJ; Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Sheffield S3 7RH, United Kingdom.
Jazyk: angličtina
Zdroj: Chemistry of materials : a publication of the American Chemical Society [Chem Mater] 2022 Aug 23; Vol. 34 (16), pp. 7232-7241. Date of Electronic Publication: 2022 Aug 03.
DOI: 10.1021/acs.chemmater.2c00905
Abstrakt: Tailoring the solution chemistry of metal halide perovskites requires a detailed understanding of precursor aggregation and coordination. In this work, we use various scattering techniques, including dynamic light scattering (DLS), small angle neutron scattering (SANS), and spin-echo SANS (SESANS) to probe the nanostructures from 1 nm to 10 μm within two different lead-halide perovskite solution inks (MAPbI 3 and a triple-cation mixed-halide perovskite). We find that DLS can misrepresent the size distribution of the colloidal dispersion and use SANS/SESANS to confirm that these perovskite solutions are mostly comprised of 1-2 nm-sized particles. We further conclude that if there are larger colloids present, their concentration must be <0.005% of the total dispersion volume. With SANS, we apply a simple fitting model for two component microemulsions (Teubner-Strey), demonstrating this as a potential method to investigate the structure, chemical composition, and colloidal stability of perovskite solutions, and we here show that MAPbI 3 solutions age more drastically than triple cation solutions.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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