Hofstetter Yvonne J, García-Benito Inés, Paulus Fabian, Orlandi Simonetta, Grancini Giulia, Vaynzof Yana
Kirchhoff Institute for Physics and the Centre for Advanced Materials, Heidelberg University, Heidelberg, Germany.
Integrated Centre for Applied Physics and Photonic Materials and Centre for Advancing Electronics Dresden (CFAED), Technical University of Dresden, Dresden, Germany.
Front Chem. 2020 Feb 13;8:66. doi: 10.3389/fchem.2020.00066. eCollection 2020.
Two-dimensional (2D) hybrid organic-inorganic perovskites have recently attracted the attention of the scientific community due to their exciting optical and electronic properties as well as enhanced stability upon exposure to environmental factors. In this work, we investigate 2D perovskite layers with a range of organic cations and report on the Achilles heel of these materials-their significant degradation upon exposure to vacuum. We demonstrate that vacuum exposure induces the formation of a metallic lead species, accompanied by a loss of the organic cation from the perovskite. We investigate the dynamics of this reaction, as well as the influence of other factors, such as X-ray irradiation. Furthermore, we characterize the effect of degradation on the microstructure of the 2D layers. Our study highlights that despite earlier reports, 2D perovskites may exhibit instabilities, the chemistry of which should be identified and investigated in order to develop suitable mitigation strategies.
二维（2D）有机-无机杂化钙钛矿最近因其令人兴奋的光学和电子特性以及在暴露于环境因素时增强的稳定性而引起了科学界的关注。在这项工作中，我们研究了一系列有机阳离子的二维钙钛矿层，并报告了这些材料的致命弱点——它们在暴露于真空时会显著降解。我们证明，真空暴露会诱导形成金属铅物种，同时伴随着钙钛矿中有机阳离子的损失。我们研究了该反应的动力学以及其他因素的影响，如X射线辐照。此外，我们还表征了降解对二维层微观结构的影响。我们的研究强调，尽管有早期报道，但二维钙钛矿可能存在不稳定性，为了制定合适的缓解策略，应确定并研究其化学性质。
