Synthetic Control of the Photoluminescence Stability of Organolead Halide Perovskites

Journal Article · Thu Oct 17 00:00:00 EDT 2019 · Journal of the Mexican Chemical Society

DOI:https://doi.org/10.29356/jmcs.v63i3.623· OSTI ID:1573237

Freppon, Daniel J. ^[1]; Men, Long ^[1]; Bhattacharjee, Ujjal ^[1]; Rosales, Bryan A. ^[2]; Zhu, Feng ^[2]; Petrich, Jacob W. ^[1]; Smith, Emily A. ^[1]; Vela, Javier  ^[1]

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1. Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry
2. Iowa State Univ., Ames, IA (United States). Dept. of Chemistry

An optimized synthetic procedure for preparing photostable nanocrystalline methylammonium lead halide materials is reported. The procedure was developed by adjusting the lead halide to methylammonium/octylammonium halide precursor ratio. At a high precursor ratio (1:3), a blue-shifted photoinduced luminescence peak is measured at 642 nm for CH₃NH₃PbI₃ with 0.01 to 12 mJ pulsed-laser irradiation. The appearance of this peak is reversible over 300 min upon blocking the irradiation. In order to determine if the peak is the result of a phase change, in situ x-ray diffraction measurements were performed. No phase change was measured with an irradiance that causes the appearance of the photoinduced luminescence peak. Luminescence microscpectroscopy measurements showed that the use of a lower precursor ratio (1:1.5) produces CH₃NH₃PbI₃ and CH₃NH₃PbBr₃ perovskites that are stable over 4 min of illumination. Given the lack of a measured phase change, and the dependence on the precursor ratio, the photoinduced luminesce peak may derive from surface trap states. Finally, the enhanced photostability of the resulting perovskite nanocrystals produced with the optimized synthetic procedure supports their use in stable optoelectronic devices.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1573237
• Report Number(s): IS-J 10069
• Journal Information: Journal of the Mexican Chemical Society, Vol. 63, Issue 3; ISSN 1870-249X
• Publisher: Sociedad Quimica de Mexico, A.C.
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
surface traps
nanocrystalline perovskites
photostability
single nanocrystal analysis
synthetic optimization
optoelectronics