Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.182
Publication date: 23rd September 2021
Nanoscale perovskite materials present substantial advantages over large-grain perovskite thin films or bulk, such as high photoluminescence quantum yield, multi-exciton generation or enhanced defect tolerance. The synthetic colloidal approach is one of the most used methods to obtain ABX3 nanocrystals. However, there are many drawbacks in their processing as thin film (purification and deposition steps, ligand interchange) that require special careful in order to preserve the excellent optoelectronic properties of the colloidal suspension. Here, we prepare ligand-free ABX3 perovskite q-dots using a pore network of insulating porous matrices as nanoreactors. [1] The infiltration with perovskite precursors followed with a mild thermal treatment leads to nanocrystals embedded in the porous structure. From that way, we achieved strict perovskite size control in the sub 10 nm range that enables the observation of quantum confinement effects in their optical response.[2] Furthermore, the strong optical absorption besides the connectivity of the NCs leads us to integrate them in a solar cell device that reach 9% of photo-conversion efficiency in an alternative configuration to that employed in previously developed QD solar cells.[3] In addition, we demonstrate that the efficient charge transport between q-dots is due to a percolation mechanism and the stability of this type of cell is higher than standard bulk devices.
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