Template-assisted synthesis of optically active CsPbI3 q-dots
Carlos Romero Pérez a, Mauricio Calvo Roggiani a, Hernán Míguez García a, Andrea Rubino a, Laura Caliò a
a Multifunctional Optical Materials Group, Institute of Materials Science of Sevilla, Consejo Superior de Investigaciones Científicas – Universidad de Sevilla (CSIC-US), Calle Américo Vespucio, 49, Sevilla, Spain
Proceedings of Applied Light-Matter Interactions in Perovskite Semiconductors 2021 (ALMIPS2021)
Online, Spain, 2021 October 5th - 7th
Organizers: Rafael Sánchez Sánchez and Miguel Anaya
Oral, Carlos Romero Pérez, presentation 012
DOI: https://doi.org/10.29363/nanoge.almips.2021.012
Publication date: 23rd September 2021

Cesium Lead Iodide perovskite (CsPbI3) is the most suitable fully inorganic perovskite for optoelectronic applications due to its proper band gap around 1.77 eV. However, it only concerns for the “black” optically active phase (α) which is only stable at temperatures above 310ºC with a subsequent degradation to the β and γ active phases and eventually to the “yellow” non-optically active orthorhombic phase (δ) which is the most stable phase at room temperature.

Here, we propose a scaffold assisted synthesis of CsPbI3 nanocrystals with “black” optically active phase. The synthesis does not require ligands nor additives. Simply using a porous network that consists in a stack of SiO2 nanospheres, we create a mesoporous scaffold with a 50% porosity which allows a further infiltration of a CsPbI3 precursor solution. After a mild thermal treatment, we obtain nanocrystals thanks to the strain conferred by the matrix during crystal growth. Nanocrystals optical properties can be tuned by means of quantum confinement effects either as a consequence of a variation in the precursor concentration solution but also by means of Iodine/Lead ratio alteration. Furthermore, the careful filling of the matrix enables an efficient charge transport between q-dots by percolation mechanism. This allow us to fabricate solar cells or deep-red emission devices

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