Passivation Mechanism Exploiting Surface Dipoles Affords High-Performance Perovskite Solar Cells
- 11 May 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 142 (26), 11428-11433
- https://doi.org/10.1021/jacs.0c01704
Abstract
The employment of 2D perovskites is a promising approach to tackle the stability and voltage issues inherent in perovskite solar cells. It remains unclear however whether other perovskites with different dimensionalities have the same effect on efficiency and stability. Here, we report the use of quasi-3D azetidinium lead iodide (AzPbI3) as a secondary layer on top of the primary 3D perovskite film that results in significant improvements in the photovoltaic parameters. Remarkably, utilization of AzPbI3 leads to a new passivation mechanism due to the presence of surface dipoles resulting in a power conversion efficiency (PCE) of 22.4 %. The open-circuit voltage obtained is as high as 1.18 V, which is among the highest reported to date for single junction perovskite solar cells, corresponding to a voltage deficit of 0.37 V for a bandgap of 1.55 eV.Funding Information
- Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung
- ?cole Polytechnique F?d?rale de Lausanne
- Ministry of Science Research and Technology
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