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

Lookup NU author(s): Dr Pablo Docampo

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2019.

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Abstract

© Copyright 2019 American Chemical Society. 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 PbI 2 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.

Publication metadata

Author(s): Schlipf J, Hu Y, Pratap S, Biessmann L, Hohn N, Porcar L, Bein T, Docampo P, Muller-Buschbaum P

Publication type: Article

Publication status: Published

Journal: ACS Applied Energy Materials

Year: 2019

Volume: 2

Issue: 2

Pages: 1011-1018

Online publication date: 06/02/2019

Acceptance date: 06/02/2019

Date deposited: 29/07/2019

ISSN (electronic): 2574-0962

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acsaem.9b00005

DOI: 10.1021/acsaem.9b00005

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