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Ruddlesden-Popper phases of methylammonium-based two-dimensional perovskites with 5-Ammonium Valeric Acid AVA2MAn-1PbnI3 n+1 with n = 1, 2, and 3

Ashari Astani, N ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.jpclett.9b01111
  3. Publisher: American Chemical Society , 2019
  4. Abstract:
  5. 5-Ammonium valeric acid (AVA) is a frequently used additive in the preparation of lead halide perovskites. However, its microscopic role as passivating, cross-linking, or templating agent is far from clear. In this work, we provide density functional theory-based structural models for the Ruddlesden-Popper (RP) phases of AVA2(CH3NH3)n-1PbnI3n+1 for n = 1, 2, and 3 and validate with experimental data on polycrystalline samples for n = 1. The structural and electronic properties of the AVA-based RP phases are compared to the ones of other linker families. In contrast to aromatic and aliphatic spacers without additional functional groups, the RP phases of AVA are characterized by the formation of a regular and stable H-bonding network between the carbonyl head groups of adjacent AVA molecules in opposite layers. Because of these additional interactions, the penetration depth of the organic layer into the perovskite sheet is reduced with direct consequences for its crystalline phase. The possibility of forming strong interlinker hydrogen bonds may lead to an enhanced thermal stability. © 2019 American Chemical Society
  6. Keywords:
  7. Electronic properties ; Hydrogen bonds ; Lead compounds ; Perovskite ; Saturated fatty acids ; Crystalline phase ; H-bonding networks ; Halide perovskites ; Polycrystalline samples ; Ruddlesden-Popper phasis ; Structural and electronic properties ; Structural models ; Templating agents ; Density functional theory
  8. Source: Journal of Physical Chemistry Letters ; Volume 10, Issue 13 , 2019 , Pages 3543-3549 ; 19487185 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acs.jpclett.9b01111