Optoelectronic devices based on ligand-free lead halide quantum dots embedded in porous matrices
Hernán Míguez a
a Instituto de Ciencia de Materiales de Sevilla (Consejo Superior de Investigaciones Científicas-Universidad de Sevilla),C/Américo Vespucio 49, 41092 Sevilla, España
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Invited Speaker, Hernán Míguez, presentation 037
Publication date: 15th November 2022

In this talk, a method to prepare optical quality films of ligand-free lead halide perovskite nanocrystals displaying quantum confinement effects by in situ preparation and processing within the void space of insulating porous matrices will be described.[1] The main photophysical properties of embedded quantum dots will be reviewed, with emphasis on the possibilities that the absence of organic ligands offer to achieve control over the optical and charge transport properties. Evidence of efficient dot-to-dot transport,[2] fast photoactivation,[3] high photoluminescence quantum yield (>85%), improved stability and enhanced durability,[4,5] with respect to their bulk counterparts, will be provided for different films made of MAPbI3, MAPbBr3, CsPbI3 , CsPbBr3 and FAPbBr3 quantum dots embedded in porous matrices. Overall, these results demonstrate that adequately designed networks of ligand-free perovskite quantum dots can be used as both light harvesters and photocarrier conductors, in an alternative configuration to those employed in previously developed QD optoelectronic devices.

Financial support of the Spanish Ministry of Science and Innovation under grant PID2020-116593RB-I00 funded by MCIN/AEI/10.13039/501100011033 and Junta de Andalucía under grant P18-RT-2291 (FEDER/UE) is gratefully acknowledged.

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