AI Article Synopsis
- A new method for preparing pure δ-formamidinium lead triiodide (δ-FAPbI) single crystals involves a liquid-phase reaction and crystallization to ensure high purity, resulting in efficient perovskite solar cells (PSCs).
- The resulting α-FAPbI inverted PSCs achieve impressive power conversion efficiencies (PCE), with a maximum recorded at 23.48% and improved to 25.07% by surface treatment.
- Notably, the long-term stability of the unencapsulated device shows it retains 97.22% of its initial efficiency after 1,000 hours of continuous illumination, outperforming control devices.
Article Abstract
Pure δ-formamidinium lead triiodide (δ-FAPbI ) single crystal for highly efficient perovskite solar cell (PCS) with long-term stability is prepared by a new method consisting of liquid phase reaction of FAI and PbI in N,N-dimethyl formamide and antisolvent crystallization using acetonitrile. In this method, the incorporation of any impurity into the crystal is excluded by the molecular recognition of the crystal growth site. This pure crystal is used to fabricate α-FAPbI inverted PSCs which showed excellent power conversion efficiency (PCE) due to much-reduced trap-states. The champion device exhibited a high PCE of 23.48% under the 1-Sun condition. Surface-treated devices with 3-(aminomethyl)pyridine showed a significantly improved PCE of 25.07%. In addition, the unencapsulated device maintained 97.22% of its initial efficiency under continuous 1-Sun illumination for 1,000 h at 85 °C in an N atmosphere ensuring long-term thermal and photo stabilities of PSCs, whereas the control device kept only 89.93%.
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| http://dx.doi.org/10.1002/smll.202305246 | DOI Listing |
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