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

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-phen...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-12, Vol.1 (46), p.17539-17549
Main Authors: Kahmann, Simon, Duim, Herman, Rommens, Alexander J, Frohna, Kyle, ten Brink, Gert H, Portale, Giuseppe, Stranks, Samuel D, Loi, Maria A
Format: Article
Language:English
Subjects:
Chemistry
Crystal defects
Crystallites
Microscopy
Microstructure
Optical microscopy
Optoelectronics
Perovskites
Photoluminescence
Thin films
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Summary: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 (PDMAPbI 4 ) 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. PDMAPbI 4 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. Films of the two-dimensional Dion-Jacobson compound PDMAPbI 4 are studied through concerted multimodal microscopy. Hyperspectral Raman and PL imaging underline the complex impact of the microstructure, composition, and orientation on the photophysics.
ISSN:2050-7526
2050-7534
DOI:10.1039/d2tc04406d