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@INPROCEEDINGS{Zaluzhnyy:644511,
      author       = {Zaluzhnyy, Ivan and Schreiber, Frank and Rysov, Rustam and
                      Unger, Frederik and Kneschaurek, Ekaterina and Hagara, Jakub
                      and Zimmermann, Paul and Schwartzkopff, Sebastian and
                      Pithan, Linus and Lapkin, Dmitry and Hinderhofer, Alexander
                      and Westermeier, Fabian and Sprung, Michael and Vaynzof,
                      Yana and Paulus, Fabian and Merten, Lena},
      title        = {{D}ynamics and kinetics of light-induced phase segregation
                      in mixed lead-halide perovskites},
      reportid     = {PUBDB-2026-00370},
      year         = {2025},
      note         = {kein PDF download angeboten, nur online lesbar},
      abstract     = {Hybrid organic-inorganic perovskites tend to undergo
                      several structural transformations that can be caused by
                      temperature, humidity and light. One of the striking is
                      light-induced halide phase segregation in mixed lead-halide
                      perovskites, i.e., formation of I-rich and Br-rich domains
                      by the illumination with visible light [1]. This effect
                      influences the homogeneity of the chemical composition of
                      the mixed perovskite phase, influence the band gaps and
                      therefore it has strong impact on the perovskite-based
                      photovoltaic devices. Several microscopic mechanisms have
                      been proposed to explain this effect, but the full
                      understanding is yet to be obtained [2].In this work, we
                      used X-ray photon correlation spectroscopy (XPCS) [3], to
                      perform time-resolved studies of the light-induced phase
                      segregation in (CH3NH3)PbBr1.8I1.2 [4] and track the
                      formation of pure (CH3NH3)PbBrI3 and (CH3NH3)PbI3. This was
                      done by observing the (001) diffraction peak from the cubic
                      perovskite lattice and, specifically, quantifying the
                      dynamics of coherent speckles originating from domains with
                      different halide concentration.We observe that the phase
                      segregation is characterized by three distinct time scales
                      corresponding to the rapid formation of small seeds of the
                      I-rich phase, fluctuations of the ion distribution around
                      the quasi-equilibrium state (dynamics), and a directional
                      drift of the ions within the crystal grains (kinetics). We
                      also investigate a series of samples with interstitials and
                      vacancies in the halide sublattice [5] and observe the
                      influence of defects in the halide sublattice on phase
                      separation. We find that samples with interstitial halides
                      exhibit slower phase separation as samples with vacancies in
                      the halide sublattice.},
      month         = {Sep},
      date          = {2025-09-08},
      organization  = {Perovskite Semiconductors: From
                       Fundamental Properties to Devices,
                       Konstanz (Germany), 8 Sep 2025 - 10 Sep
                       2025},
      cin          = {DOOR ; HAS-User / FS-EC / FS-PET-S},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)FS-EC-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P10-20150101},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.29363/nanoge.perfunpro.2025.038},
      url          = {https://bib-pubdb1.desy.de/record/644511},
}