Tang Pei, Ameri Mohsen, Liang Qiaoli, Udenze Peter I, Ouyang Zhongliang, Brown Megan, Smith Logan, Fedin Igor, Li Dawen
Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States.
Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States.
ACS Appl Mater Interfaces. 2025 May 28;17(21):31614-31626. doi: 10.1021/acsami.5c04332. Epub 2025 May 13.
Both high-power conversion efficiency (PCE) and long-term stability are critical needs for a reliable perovskite solar cell (PSC). In this work, a polyamidoamine (PAMAM) dendrimer is employed to enhance the efficiency and stability of double-cation-based PSCs via different fabrication scenarios. Based on our experimental results and numerical analysis, the application of a thin layer of PAMAM macromolecules at the interface of the perovskite absorber and the hole transport layer gives rise to enhanced performance, including both efficiency and stability due to reduced interface defects and lower carrier recombination. The results suggest that PAMAM as a capping layer can effectively passivate the surface defects of the perovskite film. As a result, a PCE of 22.8% has been achieved, while the reference devices without the PAMAM passivation layer exhibit a PCE of 20.9%. The operational stability at maximum power point (MPP) under continuous 1 sun illumination and dark storage stability show that the target perovskite/PAMAM device retains 80% of its initial PCE after 1000 h. Our research could significantly impact the field by providing valuable insights into surface passivation using macromolecules to improve the performance of perovskite-based photovoltaic devices.
对于可靠的钙钛矿太阳能电池（PSC）而言，高功率转换效率（PCE）和长期稳定性都是至关重要的需求。在这项工作中，通过不同的制备方案，采用聚酰胺-胺（PAMAM）树枝状大分子来提高双阳离子基PSC的效率和稳定性。基于我们的实验结果和数值分析，在钙钛矿吸收层与空穴传输层的界面处施加一层薄薄的PAMAM大分子，由于界面缺陷减少和载流子复合降低，从而提高了性能，包括效率和稳定性。结果表明，PAMAM作为封端层可以有效地钝化钙钛矿薄膜的表面缺陷。因此，实现了22.8%的功率转换效率，而没有PAMAM钝化层的参考器件的功率转换效率为20.9%。在连续1个太阳光照下最大功率点（MPP）的运行稳定性和黑暗存储稳定性表明，目标钙钛矿/PAMAM器件在1000小时后仍保留其初始功率转换效率的80%。我们的研究可为利用大分子进行表面钝化以提高钙钛矿基光伏器件的性能提供有价值的见解，从而对该领域产生重大影响。
