O'Kane Mary E, Smith Joel A, Alanazi Tarek I, Cassella Elena J, Game Onkar, van Meurs Sandra, Lidzey David G
Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK.
Department of Physics, College of Science, Northern Border University, Arar, 73222 (Kingdom of, Saudi Arabia.
ChemSusChem. 2021 Jun 21;14(12):2537-2546. doi: 10.1002/cssc.202100332. Epub 2021 May 28.
The development of stable perovskite precursor solutions is critical if solution-processable perovskite solar cells (PSCs) are to be practically manufacturable. Ideally, such precursors should combine high solution stability without using chemical additives that might compromise PSC performance. Here, it was shown that the shelf-life of high-performing perovskite precursors could be greatly improved by storing solutions at low-temperature without the need to alter chemical composition. Devices fabricated from solutions stored for 31 days at 4 °C achieved a champion power conversion efficiency (PCE) of 18.6 % (97 % of original PCE). The choice of precursor solvent also impacted solution shelf-life, with DMSO-based solutions having enhanced solution stability compared to those including DMF. The compositions of aged precursors were explored using NMR spectroscopy, and films made from these solutions were analysed using X-ray diffraction. It was concluded that the improvement in precursor solution stability is directly linked to the suppression of an addition-elimination reaction and the preservation of higher amounts of methylammonium within solution.
如果要实际制造可溶液加工的钙钛矿太阳能电池（PSC），稳定的钙钛矿前驱体溶液的开发至关重要。理想情况下，此类前驱体应兼具高溶液稳定性，且不使用可能会损害PSC性能的化学添加剂。在此研究中发现，通过低温储存溶液，无需改变化学成分，即可大幅提高高性能钙钛矿前驱体的保质期。由在4 °C下储存31天的溶液制备的器件实现了18.6 %的最佳功率转换效率（PCE）（为原始PCE的97 %）。前驱体溶剂的选择也会影响溶液保质期，与包含N，N-二甲基甲酰胺（DMF）的溶液相比，基于二甲基亚砜（DMSO）的溶液具有更高的溶液稳定性。使用核磁共振波谱法探究了老化前驱体的组成，并使用X射线衍射分析了由这些溶液制成的薄膜。得出的结论是，前驱体溶液稳定性的提高直接与加成-消除反应的抑制以及溶液中更高含量甲胺的保留有关。
