Facile Formation of 2D layered Perovskite Lateral Heterojunction Using Anion-Exchange Method

Mehrdad Faraji^a^,^b, Alexander Schleusener^a, Roman Krahne^a

^aDepartment of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy

^bDipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)

#MHPN3 - Fundamental Advances in Metal Halide Perovskites and Beyond: new materials, new mechanisms, and new challenges

Torremolinos, Spain, 2023 October 16th - 20th

Organizers: Paola Vivo, Qiong Wang and Kaifeng Wu

Oral, Mehrdad Faraji, presentation 246
DOI: https://doi.org/10.29363/nanoge.matsus.2023.246
Publication date: 18th July 2023

Two-dimensional Ruddlesden-Popper perovskites (2D-LRPPs) are an interesting material class with potential applications in the field of optoelectronics [1]. The 2D-LRPP semiconductor includes a metal-halide inorganic octahedral layer separated by large organic cations. This configuration provides quantum confinement and strong dielectric effects [2]. In 2D-LRPPs, the decreased mobility of halide anions in contrast to 3D counterparts limits the interdiffusion across heterostructures, which ultimately could lead to more stable heterostructures even during external perturbations like light and heat [3]. This report presents a scalable solution-based two-step methodology to fabricate microcrystalline PEA₂PbX₄-PEA₂PbX₄ (X = Br, I) lateral heterojunctions at room temperature. The fabrication of the high band gap PEA₂PbBr₄ semiconductor at the edges of the low band gap PEA₂PbI₄ semiconductor, and vice versa, lead to a band alignment that could enable a directional energy and charge flow from the high band gap material toward the low band gap material. Different anion sources, solvent mixtures, and anion concentrations influence the quality of the formed heterojunction. The results indicate that the formation of the lateral heterojunction is based on an anion exchange for PEA₂PbI₄-PEA₂PbBr₄ and dissolution-recrystallization processes for PEA₂PbBr₄-PEA₂PbI₄. The fabrications of such 2D-LRPPs heterostructure offer an opportunity to investigate charge- or energy-transfer phenomena at the heterojunction and the interchange between these materials, which could lead to their applications in optoelectronics, and among others.

References:

[1] Chen, Y.; Sun, Y.; Oeng, J.; Tang, J.; Zheng, K.; Liang, Z. 2D Ruddlesden–Popper perovskites for optoelectronics, Adv. Mater., 2018, 30, 1703487.

[2] Li, X.; Hoffman, J. M.; Kanatzidis, M. G. The 2D Halide Perovskite Rulebook: How the Spacer Influences Everything from the Structure to Optoelectronic Device Efficiency. Chem. Rev. 2021, 121, 4, 2230–2291.

[3] Akriti.; Shi, E.; Shiring, S. B.; Yang, J.; Atencio-Martinez, C. L.; Yuan, B.; Hu, X.; Gao, Y.; Finkenauer, B. P.; Pistone, A. J.; Yu, Y.; Liao, P.; Savoie, B. M.; Dou, L. Layer-by-layer anionic diffusion in two-dimensional halide perovskite vertical heterostructures. Nat. Nanotechnol. 2021, 16, 584–591.

Acknowledgements:

A.S. acknowledges the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Funding Program (Project TOGETHER, No.101067869).

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