Electrical characterisation of perovskite solar cells consisting of room-temperature atomic-layer-deposited aluminium oxide (RT-ALD-Al2 O3 ) film on top of a methyl ammonium lead triiodide (CH3 NH3 PbI3 ) absorber showed excellent stability of the power conversion efficiency (PCE) over a long time. Under the same environmental conditions (for 355 d), the average PCE of solar cells without the ALD layer decreased from 13.6 to 9.6 %, whereas that of solar cells containing 9 ALD cycles of depositing RT-ALD-Al2 O3 on top of CH3 NH3 PbI3 increased from 9.4 to 10.8 %. Spectromicroscopic investigations of the ALD/perovskite interface revealed that the maximum PCE with the ALD layer is obtained when the so-called perovskite cleaning process induced by ALD precursors is complete. The PCE enhancement over time is probably related to a self-healing process induced by the RT-ALD-Al2 O3 film. This work may provide a new direction for further improving the long-term stability and performance of perovskite solar cells.

Applied Physics and Sensors Brandenburg University of Technology Cottbus Senftenberg Konrad Wachsmann Allee 17 03046 Cottbus Germany

Charles University Faculty of Mathematics and Physics Department of Surface and Plasma Science 5 Holešovičkách 2 18000 Prague 8 Czech Republic

Helmholtz Zentrum Berlin für Materialien und Energie GmbH Institut für Silizium Photovoltaik Kekuléstrasse 5 12489 Berlin Germany

Helmholtz Zentrum Berlin für Materialien und Energie GmbH Young Investigators Group Perowskite Tandem Solar Cells Kekuléstrasse 5 12489 Berlin Germany

Surface Science Division Department of Materials Science Technical University Darmstadt Otto Berndt Strasse 3 64289 Darmstadt Germany

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