A Supramolecular Approach to Templating Hybrid Perovskites – Jovana Milic, University of Fribourg

October 29, 2020 @ 2:00 pm – 3:00 pm
Details of video conferencing will be distributed nearer the time.
Jan Behrends

Hybrid perovskites have emerged as one of the leading materials in photovoltaics due to their remarkable optoelectronic properties and solar-to-electric power conversion efficiencies [1-2]. However, their limited stabilities under ambient and operating conditions remain challenging [1-2]. On the contrary, layered hybrid perovskites based on the assemblies of organic and inorganic components feature superior operational stabilities [3-8]. To this end, supramolecular chemistry provides a powerful tool for controlling hybrid materials by tailoring noncovalent interactions. We demonstrate the utility of this approach through designing molecular modulators based on fine-tuning various noncovalent interactions [8-11], such as metal coordination [10], hydrogen [5,10] or halogen bonding [9], and π-interactions [8], among others [11]. Furthermore, their structure-directing (i.e. templating) role has been uniquely assessed by solid-state NMR spectroscopy and DFT calculations [5-7,9-11]. As a result, we obtain perovskite solar cells that exhibit superior performances and enhanced operational stabilities [8-11]. Moreover, the underlying molecular design has been extended into creating layered perovskite architectures that enable further control through templating effects [3-7]. This has been investigated by using a combination of techniques to unravel the design principles and exemplify the utility of supramolecular chemistry in advancing photovoltaics.

[1] J. V. Milić et al. Chimia 2019, 73, 317;
[2] M. Graetzel et al. Substantia 2019, 3, 27;
[3] Y. Li et al. Nano Lett. 2019, 19, 150;
[4] J. V. Milić et al. Adv. Energy Mater. 2019, 1900284;
[5] L. Hong, et al. Angew. Chem. Int. Ed. 2020, 59, 4691;
[6] F. Jahanbakhshi et al. J. Mater. Chem. A 2020, 8, 17732;
[7] M. C. Gélvez-Rueda et al. Adv. Funct. Mater. 2020, 2003428;
[8] Y. Liu et al. Sci. Adv. 2019, 5, eaaw2543;
[9] M. A. Ruiz-Preciado et al. J. Am. Chem. Soc. 2020, 142, 1645
[10] D. Bi et al. Nat. Commun. 2018, 9, 4482
[11] T-Z. Su et al. J. Am. Chem. Soc. 2020, in press.

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