Understanding the Effect of Organic Layer Thickness in Layered Perovskite Systems
Marcin Giza a, Pablo Docampo a
a School of Chemistry, University of Glasgow, University Pl, G12 8QQ, Glasgow, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Marcin Giza, 258
Publication date: 20th April 2022

Layered materials have recently emerged to address the issues of stability and performance that are limiting the potential applications of perovskite solar cells. However, these materials are currently limited by their poor charge transport characteristics.

Recent research efforts have been focused largely on maximizing performance with good success using aromatic-based Ruddlesden-Popper layered materials. In order to make further progress and guide future synthetic efforts, the relationship between the structure and charge transport needs to be fully disentangled.

Here, the interlayer spacing and the symmetry of the crystal dictate the majority of the optoelectronic properties of the material. Typically, this is explained by a tunnelling mechanism, where the barrier width determines the likelihood of the process, and therefore the conductivity. In addition, the relative positions of the energy bands also influence this parameter. In these systems, the energetics of the organic cations are given by their building blocks, but they simultaneously determine the structure, making disentangling these effects difficult.

In this poster, I investigate the structures of low-dimensional films containing aromatic and aliphatic functional groups. I determine the interlayer spacing by X-Ray diffraction measurements, which I then compare to the in-plane and out-of-plane charge transport characteristics.

My results show that simplistically focusing on reducing the interlayer width, for instance by shortening the length of aliphatic chains, is not sufficient. This can lead to a break of the symmetry of the perovskite sheets, I.e., a jagged quasi-layered perovskite.

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