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Royal Society of Chemistry

  • Perovskite

Taking a closer look – how the microstructure of Dion–Jacobson perovskites governs their photophysics

Authors Simon Kahmann, Herman Duim, Alexander J. Rommensc, Kyle Frohnaab, Gert H. ten Brinkd, Giuseppe Portalee, Samuel D. Strank and Maria A. Loi


Scarce information is available on the thin film morphology of Dion–Jacobson halide perovskites. However, the microstructure can have a profound impact on a material's photophysics and its potential for optoelectronic applications. The microscopic mechanisms at play in the prototypical 1,4-phenylenedimethanammonium lead iodide (PDMAPbI4) Dion–Jacobson compound are here elucidated through a combination of hyperspectral photoluminescence and Raman spectro-microscopy supported by x-ray diffraction. In concert, these techniques allow for a detailed analysis of local composition and microstructure. PDMAPbI4 thin films are shown to be phase-pure and to form micron-sized crystallites with a dominant out-of-plane stacking and strong in-plane rotational disorder. Sample topography, localised defects, and a strong impact of temperature-variation create a complex and heterogeneous picture of the luminescence that cannot be captured by a simplified bulk-semiconductor picture. Our study highlights the power of optical microscopy techniques used in combination, and underlines the danger of conceptual oversimplification when analysing the photophysics of perovskite thin films.

Fig. 3 Temperature dependent hyperspectral PL microscopy for three selected temperatures (250, 100, 5 K) taken with a 20 × 0.45 NA objective.

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