DataVXACS Applied Energy MaterialsPaper
journal article·2019-02-25

Shedding Light on the Moisture Stability of 3D/2D Hybrid Perovskite Heterojunction Thin Films

Johannes Schlipf, Yinghong Hu, Shambhavi Pratap, Lorenz Bießmann, Nuri Hohn, Lionel Porcar, Thomas Bein, Pablo Docampo, Peter Müller-Buschbaum

ACS Applied Energy Materials· Volume 2· Issue 2
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Source abstract

Abstract

To increase the moisture stability of hybrid perovskite photovoltaics, a combination of three-dimensional (3D) and a thin layer of two-dimensional (2D) perovskite incorporating long-chained organic cations is often employed as photoabsorber. However, the detailed interaction between water and 3D/2D perovskite heterojunctions has not been elucidated yet. Using in situ neutron and X-ray scattering techniques, we reveal surprisingly strong water uptake into 3D/2D perovskite films despite the presence of hydrophobic bulky cations. Our results show rapid disproportionation of the initial 2D phase (number of layers, m = 5) in methylammonium lead iodide (MAPI)/2D films into lower m phases under humidity. Nevertheless, the 2D perovskite inhibits the irreversible PbI2 formation, which suggests that the suppression of I– and MA+ ion migration and consequently of MAI escape is related to the improved moisture stability of MAPI/2D perovskite films. In comparison, quadruple-cation perovskites including Rb+ exhibit poor stability toward phase segregation upon exposure to moisture regardless of the 2D perovskite layer.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany

Department of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstrasse 5-13, 81377 München, Germany

Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States

Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France

School of Electrical and Electronic Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom

Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstrasse 1, 85748 Garching, Germany

Funding

Engineering and Physical Sciences Research Council · Bundesministerium f?r Bildung und Forschung · Deutsche Forschungsgemeinschaft · Center for NanoScience, Ludwig-Maximilians-Universit?t M?nchen · Bayerisches Staatsministerium f?r Bildung und Kultus, Wissenschaft und Kunst

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