• Medientyp: E-Artikel
  • Titel: Strain-activated light-induced halide segregation in mixed-halide perovskite solids
  • Beteiligte: Zhao, Yicheng [VerfasserIn]; Miao, Peng [VerfasserIn]; Tarragó, Mariona [VerfasserIn]; de Ligny, Dominique [VerfasserIn]; Przybilla, Thomas [VerfasserIn]; Denninger, Peter [VerfasserIn]; Will, Johannes [VerfasserIn]; Zhang, Jiyun [VerfasserIn]; Tang, Xiaofeng [VerfasserIn]; Li, Ning [VerfasserIn]; He, Chenglin [VerfasserIn]; Pan, Anlian [VerfasserIn]; Elia, Jack [VerfasserIn]; Meixner, Alfred J. [VerfasserIn]; Spiecker, Erdmann [VerfasserIn]; Zhang, Dai [VerfasserIn]; Brabec, Christoph J. [VerfasserIn]; Hu, Huiying [VerfasserIn]; Wang, Xiaoxia [VerfasserIn]; Heumueller, Thomas [VerfasserIn]; Hou, Yi [VerfasserIn]; Matt, Gebhard J. [VerfasserIn]; Osvet, Andres [VerfasserIn]; Chen, Yu-Ting [VerfasserIn]
  • Erschienen: Nature Publishing Group UK, 2020
  • Erschienen in: Nature Communications 11(1), 6328 (2020). doi:10.1038/s41467-020-20066-7
  • Sprache: Englisch
  • DOI: https://doi.org/10.1038/s41467-020-20066-7
  • ISSN: 2041-1723
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  • Beschreibung: Light-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration over approximately 50%. Free-standing single crystals of CH3NH3Pb(I0.65Br0.35)3 (35%Br) do not show halide segregation until uniaxial pressure is applied. Besides, 35%Br single crystals grown on lattice-mismatched substrates (e.g. single-crystal CaF2) show inhomogeneous segregation due to heterogenous strain distribution. Through scanning probe microscopy, the above findings are successfully translated to polycrystalline thin films. For 35%Br thin films, halide segregation selectively occurs at grain boundaries due to localized strain at the boundaries; yet for 65%Br films, halide segregation occurs in the whole layer. We close by demonstrating that only the strain-activated halide segregation (35%Br/45%Br thin films) could be suppressed if the strain is properly released via additives (e.g. KI) or ideal substrates (e.g. SiO2).
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