Kozlov Sergey S, Alexeeva Olga V, Nikolskaia Anna B, Petrova Vasilisa I, Karyagina Olga K, Iordanskii Alexey L, Larina Liudmila L, Shevaleevskiy Oleg I
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia.
N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia.
Polymers (Basel). 2025 Feb 28;17(5):653. doi: 10.3390/polym17050653.
Controlling traps and structural defects in perovskite absorber layers is crucial for enhancing both the device efficiency and long-term stability of perovskite solar cells (PSCs). Here we demonstrate the modification of perovskite films by introducing low-cost green polymers, polysuccinimide (PSI) and polyasparagine (PASP), into the perovskite layer. Structural, morphological and optoelectronic properties of polymer-modified perovskite films were probed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and UV-Vis spectroscopy. The incorporation of PSI triggers interactions between the polymer and perovskite, leading to the passivation of surface defects at the grain boundaries and improved morphology of perovskite films. This defect passivation boosted PSC performance, providing power conversion efficiency (PCE) values up to 20.1%. An optimal polymer concentration of 0.1 mg/mL in the perovskite precursor solution was identified for an improvement in the photovoltaic performance. It was shown that the primary factor leading to the observed enhancement in the power conversion efficiency for PSI-modified PSCs is the increase in the lifetime of charge carriers due to the efficient passivation of surface defects and suppression of recombination losses. Additionally, PSI-modified PSCs demonstrated enhanced stability, retaining over 80% of their initial efficiency after 40 days of storage under ambient conditions without encapsulation. The obtained results highlight the effectiveness of green polymer additives in passivating surface defects in perovskite films and provide a viable approach for improving the stability and performance of perovskite solar cells.
控制钙钛矿吸收层中的陷阱和结构缺陷对于提高钙钛矿太阳能电池（PSC）的器件效率和长期稳定性至关重要。在此，我们展示了通过将低成本绿色聚合物聚琥珀酰亚胺（PSI）和聚天冬酰胺（PASP）引入钙钛矿层来对钙钛矿薄膜进行改性。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和紫外可见光谱对聚合物改性钙钛矿薄膜的结构、形态和光电性能进行了探测。PSI的掺入引发了聚合物与钙钛矿之间的相互作用，导致晶界处表面缺陷的钝化以及钙钛矿薄膜形态的改善。这种缺陷钝化提高了PSC的性能，提供了高达20.1%的功率转换效率（PCE）值。确定了钙钛矿前驱体溶液中0.1 mg/mL的最佳聚合物浓度可改善光伏性能。结果表明，导致PSI改性PSC功率转换效率提高的主要因素是由于表面缺陷的有效钝化和复合损失的抑制，电荷载流子寿命的增加。此外，PSI改性的PSC表现出增强的稳定性，在无封装的环境条件下储存40天后仍保留其初始效率的80%以上。所得结果突出了绿色聚合物添加剂在钝化钙钛矿薄膜表面缺陷方面的有效性，并为提高钙钛矿太阳能电池的稳定性和性能提供了一种可行的方法。
