Proceedings of nanoGe Fall Meeting19 (NFM19)
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.