A-site Cation Engineering in Two-Dimensional Hybrid Perovskites
Susana Ramos Terrón a, Cristóbal Verdugo Escamilla b, Luis Camacho Delgado a, Gustavo de Miguel Rojas a
a Department of Physical Chemistry and Applied Thermodynamics, University of Cordoba, Spain
b Laboratory for Crystallographic Studies, The Andalusian Earth Sciences Institute CSIC-University of Granada, Spain
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Susana Ramos Terrón, presentation 104
DOI: https://doi.org/10.29363/nanoge.hopv.2022.104
Publication date: 20th April 2022

The partial incorporation of large organic cations into the octahedral sites of 3D perovskites has been widely investigated but few works have reported their addition in 2D Ruddlesden–Popper (RP) perovskites. Here, the gradual substitution of the methylammonium (MA) cation in thin films of 2D RP perovskites (BA)2(MA)2Pb3I10 (BA = n-butylammonium) by guanidinium (Gua), dimethylammonium (DA), ethylammonium (EA), rubidium (Rb), propylammonium (PA), cesium (Cs) or formamidinium (FA) to synthesize mixed A-cation (BA)2(MA1-xAx)2Pb3I10 perovskites has been studied. The limit in the percentage of the A-site cation at which it is homogeneously incorporated in all n phases without destabilizing the overall structure is determined. It is found that the structural changes in the 2D RP perovskites may lead to modifications of the optoelectronic properties as larger bandgap (EA), blue-shift of the PL peak position (above the threshold), strong quenching of the PL (Cs) or reduced concentration of trap states (Gua and EA). Solar devices fabricated with the different mixed A-cation 2D RP display an enhanced performance for those perovskites containing low percentages of Gua or EA cations. This characterization is very valuable to correlate the size and shape of the A-cation with the changes of the properties of the material.

S.R.-T. thanks the Ministry of Education, Culture, and Sport for a FPU fellowship (FPU18/04452). This work was financially supported by the Ministerio de Economía y Competitividad (MINECO) through project CTQ2017-84221-R, cofinanced with FEDER funds.

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