Abstract
The stabilization of grain boundaries and surfaces of the perovskite layer is critical to extend the durability of perovskite solar cells. Here we introduced a sulfonium-based molecule, dimethylphenethylsulfonium iodide (DMPESI), for the post-deposition treatment of formamidinium lead iodide perovskite films. The treated films show improved stability upon light soaking and remains in the black α phase after two years ageing under ambient condition without encapsulation. The DMPESI-treated perovskite solar cells show less than 1% performance loss after more than 4,500 h at maximum power point tracking, yielding a theoretical T80 of over nine years under continuous 1-sun illumination. The solar cells also display less than 5% power conversion efficiency drops under various ageing conditions, including 100 thermal cycles between 25 °C and 85 °C and an 1,050-h damp heat test.
Original language | English |
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Pages (from-to) | 172-183 |
Number of pages | 12 |
Journal | Nature Energy |
Volume | 9 |
Issue number | 2 |
Early online date | 4 Jan 2024 |
DOIs | |
Publication status | Published - Feb 2024 |
Bibliographical note
Funding:Open access funding provided by Uppsala University.