Study of Structural and Optical properties of Perovskites Quantum Dots with complex cation in A-site
Juan Jesús Gallardo a, María Isabel Rodríguez a, Eduardo Blanco b, Javier Navas a
a Department of Physical Chemistry. Faculty of Science. University of Cádiz. Spain.
b Department of Condensed Matter Physics. Faculty of Science. University of Cádiz. Spain.
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Oral, Juan Jesús Gallardo, presentation 020
Publication date: 25th November 2019

In this work, lead perovskites quantum dots with a complex cation in A-site and mixed halides, Cs0.1FA0.1MA0.8Pb(I3-xBrx), where x= 0, 1, 2 and 3, have been synthesized in toluene and characterized by different spectroscopic techniques. The influence of the complex A-site cation on the fluorescent emission has been studied in comparison with MAPI perovskite. As a result, a red shift in the emission spectrum has been found for the triple cation lead iodide perovskite against the MAPI, due to the composition of the A-site cation and not to a change in the crystalline structure as XRD patterns revealed. In the case of mixed halides perovskites quantum dots, a blue shift from the all iodide perovskite to the all bromide perovskite has been found, as expected, with a displacement in the emission maximum in comparison with the methylammonium lead perovskites quantum dots, demonstrating the influence of both, the mixed halides and A-site cation compositions, in the light emission of the perovskites quantum dots. 

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