Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.029
Publication date: 22nd December 2022
Incorporating organic semiconductor (OS) spacer cations into layered lead halide perovskites provides a powerful approach to tune the optoelectronic properties of the resulting organic-inorganic hybrid materials. Forming type-II nano heterostructures using OS spacers, for example, allows the partitioning of charge carriers either in the organic or inorganic layer and provides a potential strategy to overcome intrinsically high exciton binding energies in layered perovskites by facilitating charge separation.[1] However, large OS cations with suitable energy levels remain challenging to incorporate into a layered perovskite structure resulting in relatively few systems reported and characterized.
In this regard, our lab developed novel OS cations and optimized processing conditions to afford incorporation in layered perovskites.[2,3] In this presentation, we elucidate novel OS cations based on rylene dyes chromophores incorporation into a layered perovskite and elaborate the size limitations of the chromophore when it comes to the formation of (2D) layered perovskite structure. Using transient absorption (TA) and time resolved photoluminescent spectroscopy (TRPL) we indicate the formation of charge-transfer excitons at the perovskite-OS interface and further investigate the effect of the distance of the chromophore to the perovskite layer on the electron-transfer process from the perovskite layer to the OS cation. Time resolved microwave conductivity (TRMC) measurements and terahertz spectroscopy was used to elucidate the effect of the type-II nano heterostructure on the photogenerated free charge-carrier showing enhanced carrier lifetimes compared to layered perovskites incorporating aliphatic spacers cations. The presented work implies the possibility to mitigate the inefficient charge-separation process due to the high exciton-binding energy in lead-halide layered perovskite by forming OS-perovskite nano heterostructures opening the door for a new class of material.
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