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  • Author(s):
    Ilia Pavlovetc, Michael Brennan, Seriu Draguta, Anthony Ruth, Taylor Moot, Jeffrey A. Christians, Kyle Aleshire, Steve Harvey, Stefano Toso, Sanjini Nanyakkara, Jonah Messinger, Joseph Luther, Marsaru Kuno
    Abstract:

    on migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging…

    Date Published:
    2020-08
    Record Visibility:
    Public
  • Author(s):
    Stefano Toso, Ilia Pavlovetc, Maksym Zhukovskyi, Sergio Marras, Masaru Kuno, Liberato Mann, Dmitry Baranov
    Abstract:

    Perovskite nanocrystal superlattices (NC SLs) are the nearest real-world approximations to monodisperse NC ensembles. NC SLs thus represent ideal model systems for evaluating the optical and structural stability of CsPb(I1−xBrx)3 NCs at a macroscopic level. Here, photoinduced changes to CsPb(I1−xBrx)3 NC SLs (0 < x < 1.0) are probed via in situ photoluminescence, X-ray diffraction, and electron microscopy. We find that prolonged (∼10−20 h) ultraviolet−visible irradiation causes irrevers…

    Date Published:
    2020-11
    Record Visibility:
    Public