In-situ Evaluation of Water Interactions with Large Organic Cation Passivated MAPbX3 by Using Photoluminescence Spectroscopy
Mehmet Derya Özeren a, Bea Botka a, Áron Pekker a, Katalin Kamarás a
a Wigner Research Centre for Physics
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
Contributed talk, Mehmet Derya Özeren, presentation 102
Publication date: 20th April 2022

Hybrid halide perovskites are the most promising materials for low-cost optoelectronic applications. Understanding the perovskite defect chemistry and passivating the perovskite surface and bulk defects by chemical interactions boosted the performance of these materials in the recent years. However, stability of the small cation 3D perovskites is the major setback to fulfil their potential in the application area. Passivation of the surface defects by allowing the formation of 2D perovskite layer with long alkyl chain- or benzene ring-containing large organic cations (such as butylammonium, phenylethylammonium) on the surface is considered as one of the promising approaches to protect the vulnerable surface against water molecules. 

In-situ interactions between water molecules and their effect on the perovskite electronic properties can be examined effectively by using photoluminescence spectroscopy. We evaluated the photoluminescence response of 2D, 3D/2D, and weakly confined 3D perovskites under humid nitrogen flow and compared them to pristine 3D (MAPbX3) perovskite. This study contributes to the understanding of the role of chemical interactions in the stability of 3D perovskites and evaluating the protective use of large organic cations as surface passivation molecules or ligands.

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