Poly(ethylene glycol) diacrylate (PEGDA) is introduced into the SnO₂ dispersion as the polymer framework to hinder the agglomeration. The PEGDA-modified SnO₂ acted as the electron transport layer (ETL) in n-i-p structured perovskite solar cells (pero-SCs). It is demonstrated that the PEGDA plays multifunctional roles in the enhancement of photovoltaic performance and stability against illumination and humility. First, the PEGDA-modified SnO₂ ETL is more uniform, and its energy level matched well with the perovskite, which could facilitate the carrier transport and reduce the energy loss. Second, PEGDA could passivate the defects at the interface between perovskite and ETL. Eventually, a power conversion efficiency (PCE) of 23.31% is achieved for the α-FAPbI₃ based pero-SCs. Most importantly, the unencapsulated devices maintained more than 90% of the initial PCE after 850 h continuous illumination (100 mW/cm²). This study could provide insight for the low-cost, facile, and efficient interface modification for the pero-SCs.

中文翻译：

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多功能聚合物骨架改性 SnO2 使光稳定的 α-FAPbI3 钙钛矿太阳能电池的效率超过 23%

将聚（乙二醇）二丙烯酸酯（PEGDA）作为聚合物骨架引入到 SnO ₂分散体中以阻止团聚。PEGDA 修饰的 SnO ₂在 nip 结构的钙​​钛矿太阳能电池 (pero-SCs) 中充当电子传输层 (ETL)。结果表明，PEGDA 在增强光伏性能和对光照和湿度的稳定性方面发挥着多功能作用。首先，PEGDA修饰的SnO ₂ ETL更均匀，其能级与钙钛矿匹配良好，可以促进载流子传输并减少能量损失。其次，PEGDA 可以钝化钙钛矿和 ETL 之间界面处的缺陷。最终，α-FAPbI 实现了 23.31% 的功率转换效率 (PCE)_{3 个}基于 pero-SC。最重要的是，在 850 小时连续照明 (100 mW/cm ² )后，未封装的器件保持了初始 PCE 的 90% 以上。这项研究可以为 pero-SC 的低成本、简便和有效的界面修改提供见解。