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Issue 2, 2018
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In situ induced core/shell stabilized hybrid perovskites via gallium(iii) acetylacetonate intermediate towards highly efficient and stable solar cells

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Abstract

Long-term stability of perovskite solar cells appears to be the bottleneck that limits its large-scale industrialization. Herein, we innovatively introduce gallium(III) acetylacetonate (GaAA3) as the precursor additive to in situ induce a metal–organic-complex monomolecular intermediate ([GaAA3]4), which allows to realize CsxFA1−xPbI3–[GaAA3]4 (0 < x < 1) hybrid perovskite materials. The formed hybrid perovskites are proven to possess a thus far unreported structure with CsxFA1−xPbI3 core and [GaAA3]4 shell, and the presence of thin [GaAA3]4 shells remarkably enhances the hydrophobicity of the perovskite thin films. As a result of an effective passivation effect by the core/shell heterostructure, the formed perovskites demonstrate superior photoelectronic performance in comparison with the independent archetype 3-dimensional (3D) counterparts, e.g., they show low defect-state density, strong luminescence, and long lifetime of photo-generation charge carriers, which finally result in a high power conversion efficiency of 18.24% for core–shell planar perovskite solar cells. Equally important, the stabilized power output (SPO) of the unencapsulated cell remains over 18% for 5 h in an adverse atmosphere with 50% relative humidity (RH). The present study provides a facile approach to fabricate core–shell perovskite solar cells with high efficiency and long-term stability against moisture.

Graphical abstract: In situ induced core/shell stabilized hybrid perovskites via gallium(iii) acetylacetonate intermediate towards highly efficient and stable solar cells

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Supplementary files

Article information


Submitted
30 Oct 2017
Accepted
05 Jan 2018
First published
05 Jan 2018

Energy Environ. Sci., 2018,11, 286-293
Article type
Communication

In situ induced core/shell stabilized hybrid perovskites via gallium(III) acetylacetonate intermediate towards highly efficient and stable solar cells

W. Li, C. Zhang, Y. Ma, C. Liu, J. Fan, Y. Mai and R. E. I. Schropp, Energy Environ. Sci., 2018, 11, 286 DOI: 10.1039/C7EE03113K

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