Chemistry of Materials
was obtained by direct Fourier transformation of S(Q)
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Optical Properties of Methylammonium Lead
Iodide across the Tetragonal to Cubic Phase
Transition: Implications for Perovskite Solar
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with a Qmax = 27 Å . Xꢀray PDFs were analyzed using the
3
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program PDFGUI. Parameters for scale and the quadꢀ
ratic atomic correlation factor were allowed to refine.
Values of the instrumental variables Qdamp and Qbroad
were determined from data collected on a CeO standard.
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Li, J.; Yuan, X.; Jing, P.; Li, J.; Wei, M.; Hua,
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ASSOCIATED CONTENT
Supporting Information
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Diroll, B. T.; Nedelcu, G.; Kovalenko, M. V.;
The Supporting Information is available free of charge
on the ACS Publications website at DOI:
Schaller,
Photoluminescence of CsPbX
R.
D.
HighꢀTemperature
(X = Cl, Br, I)
3
TEM image; UVꢀvis and PL spectra; variable temperaꢀ
ture laboratory diffraction data; structural parameters of
Rietveld refinements; parameters for PDF analysis; room
temperature PDF G(r); PDF quality of fits as a function
of temperature (PDF)
Nanocrystals. Adv. Funct. Mater. 2017, 27,
1606750.
Stoumpos, C. C.; Malliakas, C. D.; Peters, J. A.;
Liu, Z.; Sebastian, M.; Im, J.; Chasapis, T. C.;
Wibowo, A. C.; Chung, D. Y.; Freeman, A. J.; et
al. Crystal Growth of the Perovskite
AUTHOR INFORMATION
3
Semiconductor CsPbBr ꢀ: A New Material for
HighꢀEnergy Radiation Detection. Cryst.
Growth Des. 2013, 13, 2722–2727.
Corresponding Author
*Email: brutchey@usc.edu
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Cottingham, P.; Brutchey, R. L. On the Crystal
Structure of Colloidally Prepared CsPbBr 3
Quantum Dots. Chem. Commun. 2016, 52,
5246–5249.
ACKNOWLEDGMENTS
This work was supported by the U.S. Department of Enꢀ
ergy, Office of Science, Basic Energy Sciences, under
Award # DE−FG02−11ER46826. Use of the Advanced
Photon Source at Argonne National Laboratory was supꢀ
ported by the U.S. Department of Energy, Office of Sciꢀ
ence, Office of Basic Energy Sciences, under Contract No.
DE−AC02−06CH11357. The authors thank Karena
Chapman (11ꢀIDꢀB) and Lynne Ribaud (11ꢀBM) for their
assistance with experiments at the APS. The MRL shared
experimental facilities at the University of California,
Santa Barbara are supported by the MRSEC Program of
the NSF under Award No. DMR 1720256; a member of
the NSFꢀfunded Materials Research Facilities Network.
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