Supramolecular Engineering of Layered Hybrid Perovskite Materials for Stable Perovskite Solar Cells
Jovana Milic a, Dominik Kubicki a b, Lyndon Emsley b, Michael Graetzel a
a Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland
b Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)
#PERFuDe19. Halide perovskites: when theory meets experiment from fundamentals to devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Claudine Katan, Wolfgang Tress and Simone Meloni
Oral, Jovana Milic, presentation 012
DOI: https://doi.org/10.29363/nanoge.nfm.2019.012
Publication date: 18th July 2019

While hybrid perovskite solar cells attract considerable attention due to their remarkable solar-to-electric power conversion efficiencies,[1] their limited stability and molecular-level engineering remain challenging.[1–4] In contrast to three-dimensional perovskites, their layered analogs show promising stabilities.[1,5-6] In order to benefit from their enhanced stabilities without compromising the performance, we demonstrate a supramolecular strategy in the design of organic spacers based on fine-tuning noncovalent interactions complemented by their structural adaptability.[4-6] These systems are devised to interact with the perovskite surface in a manner uniquely assessed by solid-state NMR spectroscopy.[3-4,6] As a result, we obtain solar cells with superior properties based on formamidinium lead iodide compositions with efficiencies surpassing those of the state-of-the-art formamidinium-based layered perovskites, accompanied by enhanced stabilities.[5-6] This has been investigated using a combination of techniques to unravel the design principles and exemplify the role of supramolecular engineering in advancing perovskite solar cell research.

The authors are grateful to all the colleagues and collaborators contributing to the presented work, as well as the funding agencies supporting the research that is presented.

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