Optoelectronic devices based on scaffold stabilized black-phase CsPbI3 quantum dots
Carlos Romero Pérez a, Andrea Rubino a, Laura Caliò a, Mauricio Calvo Roggiani a, Hernan Míguez García a
a Instituto de Ciencia de Materiales de Sevilla (CSIC-US), C/ Américo Vespucio 49, Sevilla, 41092, ES
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
Poster, Carlos Romero Pérez, 256
Publication date: 20th April 2022

In this work, we present a scaffold assisted synthesis of CsPbI3 quantum dots (QDs) in the “black” optically active phase directly in a film. By using a porous network made of stacked SiO2 nanospheres, we create a mesoporous scaffold with a 50% porosity which allows a further infiltration of a CsPbI3 precursor solution. After a thermal treatment at only 100ºC, we obtain CsPbI3 QDs thanks to the strain conferred by the matrix during crystal growth without the need of any ligands nor additives. Nanocrystals optical properties can be tuned by means of quantum confinement effects either varying the precursor solution concentration but also as a consequence of Iodine/Lead ratio (I-/Pb2+) alteration. Additionally, the control in the filling of the matrix enables an efficient charge transport between QDs by charge percolation mechanism. This allows us to develop solar cells or deep-red emission devices.

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