Abstract
Tin-based perovskites with excellent optoelectronic properties and suitable band gaps are promising candidates for the preparation of efficient lead-free perovskite solar cells (PSCs). However, it is challenging to prepare highly stable and efficient tin-based PSCs because Sn 2+ in perovskites can be easily oxidized to Sn 4+ upon air exposure. Here we report the fabrication of air-stable FASnI 3 solar cells by introducing hydroxybenzene sulfonic acid or its salt as an antioxidant additive into the perovskite precursor solution along with excess SnCl 2 . The interaction between the sulfonate group and the Sn 2+ ion enables the in situ encapsulation of the perovskite grains with a SnCl 2 –additive complex layer, which results in greatly enhanced oxidation stability of the perovskite film. The corresponding PSCs are able to maintain 80 % of the efficiency over 500 h upon air exposure without encapsulation, which is over ten times longer than the best result reported previously. Our results suggest a possible strategy for the future design of efficient and stable tin-based PSCs.
Original language | English |
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Pages (from-to) | 806-810 |
Number of pages | 5 |
Journal | Angewandte Chemie - International Edition |
Volume | 58 |
Issue number | 3 |
DOIs | |
Publication status | Published - 14 Jan 2019 |
Keywords
- antioxidants
- perovskite phases
- solar cells
- tin
ASJC Scopus subject areas
- Catalysis
- General Chemistry