Surface Dimensionality Reduction via Forming Dion-Jacobson Phase Enhancing Humidity Stability of Inorganic Perovskite Solar Cells
Luyan Wu a, Saba Michele a, Antonio Abate b, Guixiang Li b, Hao Zhang c, Hans Köbler b, Daniela Marongiu a
a Dipartimento di Fisica, Università degli Studi di Cagliari, Monserrato (CA), I-09042, Italy
b Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
c Laboratoire Ondes et Matière d’Aquitaine, Université de Bordeaux & CNRS, 33405 Talence, France
Poster, Luyan Wu, 026
Publication date: 3rd April 2023

Inorganic perovskites are highly sensitive to humidity, which easily transform to non-perovskite phase. Such phase instability issue has been challenging the long-term operational stability of solar cells. Here, we report a surface dimensionality reduction strategy, using 2-(4-aminophenyl) ethylamine cation to construct Dion-Jacobson 2D phase that covers the surface of 3D inorganic perovskite structure. The Dion-Jacobson layer is mainly grown at the grain boundaries of the perovskite, effectively passivating surface defects and providing favorable interfacial charge transfer. The resulted inorganic perovskite films exhibit an excellent humidity resistance when exposed to the aqueous solvent (25% water) and 50% humidity air atmosphere. With structure conversion, the DJ 2D/3D inorganic perovskite solar cell (PSC) achieves a power conversion efficiency (PCE) of 19.5% with a Voc of 1.197 eV. It retains 83% of initial PCE after 1260 h of maximum power point tracking under 1.2 sun illumination. Our work demonstrated an effective way for stabilizing efficient inorganic perovskite solar cells.

This work was funded by Fondazione di Sardegna through project 2F20000210007 “Perovskite materials for photovoltaics” and project F73C22001160007 “Single crystal hybrid perovskite thin films for optoelectronics”. We also acknowledge support by PON “Ricerca e Innovazione” 2014–2020—Fondo sociale europeo, Attraction and International Mobility—Codice AIM1809115 Num. Attività 2, Linea 2.1. The authors thank Helmholtz-Zentrum Berlin for support platform for experiments.

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