1. Taking a closer look - how the microstructure of Dion-Jacobson perovskites governs their photophysics
- Author
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Simon Kahmann, Herman Duim, Alexander J. Rommens, Kyle Frohna, Gert H. ten Brink, Giuseppe Portale, Samuel D. Stranks, Maria A. Loi, Kahmann, Simon [0000-0001-7784-5333], Frohna, Kyle [0000-0002-2259-6154], Ten Brink, Gert H [0000-0002-7807-8831], Portale, Giuseppe [0000-0002-4903-3159], Stranks, Samuel D [0000-0002-8303-7292], Loi, Maria A [0000-0002-7985-7431], Apollo - University of Cambridge Repository, Photophysics and OptoElectronics, Nanostructured Materials and Interfaces, and Macromolecular Chemistry & New Polymeric Materials
- Subjects
34 Chemical Sciences ,3406 Physical Chemistry ,Materials Chemistry ,General Chemistry ,40 Engineering - Abstract
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.
- Published
- 2022