Giuri Antonella, Rolston Nicholas, Colella Silvia, Listorti Andrea, Esposito Corcione Carola, Elmaraghi Hannah, Lauciello Simone, Dauskardt Reinhold H, Rizzo Aurora
CNR NANOTEC, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy.
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
ACS Appl Energy Mater. 2021 Oct 25;4(10):11194-11203. doi: 10.1021/acsaem.1c02058. Epub 2021 Sep 27.
Herein, we focus on improving the long-term chemical and thermomechanical stability of perovskite solar cells (PSCs), two major challenges currently limiting their commercial deployment. Our strategy incorporates a long-chain starch polymer into the perovskite precursor. The starch polymer confers multiple beneficial effects by forming hydrogen bonds with the methylammonium iodide precursor, templating perovskite growth that results in a compact and homogeneous film deposited in a simple one-step coating (antisolvent-free). The inclusion of starch in the methylammonium lead iodide films strongly improves their thermomechanical and environmental stability while maintaining a high photovoltaic performance. The fracture energy ( ) of the film is increased to above 5 J/m by creating a nanocomposite that provides intrinsic reinforcement at grain boundaries. Additionally, improved optoelectronic properties achieved with the starch polymer enable good photostability of the active layer and enhanced resistance to thermal cycling.
在此，我们专注于提高钙钛矿太阳能电池（PSC）的长期化学稳定性和热机械稳定性，这是目前限制其商业应用的两个主要挑战。我们的策略是将一种长链淀粉聚合物纳入钙钛矿前驱体中。该淀粉聚合物通过与碘化甲铵前驱体形成氢键、为钙钛矿生长提供模板，从而带来多种有益效果，最终形成一种致密且均匀的薄膜，可通过简单的一步涂层（无反溶剂）沉积而成。在碘化铅甲铵薄膜中加入淀粉，能在保持高光伏性能的同时，极大地提高其热机械稳定性和环境稳定性。通过创建一种在晶界处提供内在增强作用的纳米复合材料，薄膜的断裂能（）提高到了5 J/m以上。此外，淀粉聚合物带来的改善后的光电性能使活性层具有良好的光稳定性，并增强了对热循环的抗性。
