Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.232
Publication date: 18th July 2019
Two-dimensional halide perovskites are analogues of 3D perovskites that are of strong interest for photovoltaics. These 2D-analogues have properties that are markedly different than those of the corresponding 3D perovskites, for instance a considerably larger band gap and much stronger interactions between electrons and hole in the inorganic part of the material, i.e. a much large exciton binding energy. We have shown in a recent study that also the exciton binding energy can be tuned over a large range by varying this thickness.
Until now, most of the large organic cations used in 2D or quasi-2D perovskite materials only act as a spacer, defining the dimensionality of the system. Their HOMO-LUMO gap is generally very large and the electronic properties of the resulting materials are fully determined by the properties of the inorganic layers.
In this work, we aim to introduce additional functionality in the organic part. An example of such functionality is the introduction of electron donors or acceptors resulting in enhanced charge separation. We have explored the introduction of functional organic chromophores theoretically by density functional theory calculations and show that it is possible to introduce conjugated molecules that have a significant effect on the electronic structure. Strong electron acceptors or donors lead to conduction band or valence band edges that are localized on the organic part of the materials. This could lead to enhanced charge separation.
In a subsequent step we have synthesized 2D perovskites with functional organic chromophore and show, by time-resolved spectroscopy, that this indeed leads to charge separation where either the electron or the hole remains on the inorganic layers. Using microwave conductivity we show that this indeed leads to a strongly enhanced photoconductivity. This works shows that it is possible to introduce specific functionality in the organic spacer layer in order to tune 2D perovskite for specific application
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