Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Two-dimensional layered perovskites can be obtained by replacing common small singly charge cations such as methylammonium, cesium or formamidinium by a larger cation, for instance butyl ammonium. Mixtures of small and large cations can results in so-called Ruddlesden-Popper structures where multiple layers of inorganic perovskite are separated by organic layers. This approach can be used to tune the absorption and emission properties but in almost all examples the organic part has no specific functionality. In this work we explore possibilities to introduce specific functionality in these sidechains. Using pulse-radiolysis time-resolved microwave conductivity measurements we can study the mobility of charges and their recombination kinetics. As a first example, we discuss the effect of the length of the alkyl chains that separate the inorganic layers on the recombination of charge. This is related to the inter-layer transport in these materials, which is a key parameter in the efficiency of light emitting diodes. In the second example we explore the introduction of more functionality in the organic part using electronic structure calculations. For instance the introduction of a strongly electron accepting chromophore can lead to enhanced exciton dissociation in the 2D perovskites. This is important since it has been shown that exciton binding energies in these materials are so high that most charges exist as bound excitons at room temperature. Overall, we demonstrate that the opto-electronic properties of 2-D perovskites can be tuned, not only by varying the thickness and composition of the inorganic part but also by introducing specific functionality in the organic component.
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