Photoinduced, reversible phase transitions in all-inorganic perovskite nanocrystals

Kirschner, Matthew S.; Diroll, Benjamin T.; Guo, Peijun; Harvey, Samantha M.; Helweh, Waleed; Flanders, Nathan C.; Brumberg, Alexandra; Watkins, Nicolas E.; Leonard, Ariel A.; Evans, Austin M.; Wasielewski, Michael R.; Dichtel, William R.; Zhang, Xiaoyi; Chen, Lin X.; Schaller, Richard D.

doi:10.1038/s41467-019-08362-3

Title: Photoinduced, reversible phase transitions in all-inorganic perovskite nanocrystals

Journal Article · 30 January 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-08362-3 · OSTI ID:1494798

^[1]; Diroll, Benjamin T. ^[2];

^[2]; Harvey, Samantha M. ^[1]; Helweh, Waleed ^[1];

^[1]; Brumberg, Alexandra ^[1]; Watkins, Nicolas E. ^[1]; Leonard, Ariel A. ^[3]; Evans, Austin M. ^[1]; Wasielewski, Michael R. ^[1];

^[1]; Zhang, Xiaoyi ^[4]; Chen, Lin X. ^[3];

^[5]

Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Science and Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

Significant interest exists in lead trihalides that present the perovskite structure owing to their demonstrated potential in photovoltaic, lasing, and display applications. These materials are also notable for their unusual phase behavior often displaying easily accessible phase transitions. In this work, time-resolved X-ray diffraction, performed on perovskite cesium lead bromide nanocrystals, maps the lattice response to controlled excitation fluence. These nanocrystals undergo a reversible, photoinduced orthorhombic-to-cubic phase transition which is discernible at fluences greater than 0.34 mJ cm^-2 through the loss of orthorhombic features and shifting of high-symmetry peaks. This transition recovers on the timescale of 510 ± 100 ps. A reversible crystalline-to-amorphous transition, observable through loss of Bragg diffraction intensity, occurs at higher fluences (greater than 2.5 mJ cm^-2). These results demonstrate that light-driven phase transitions occur in perovskite materials, which will impact optoelectronic applications and enable the manipulation of non-equilibrium phase characteristics of the broad perovskite material class.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF) (United States)

Grant/Contract Number:: AC02-06CH11357; FG02-99ER14999

OSTI ID:: 1494798

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Photoinduced, reversible phase transitions in all-inorganic perovskite nanocrystals

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