A facilitated approach for improving the efficiency and stability of perovskite solar cells is explored by introducing the potassium cation-18-crown ether-6 (18C6) complexes at the interface of the electron transport layer and perovskite absorber layer. The results indicated that the 18C6 molecular can capture the potassium cation (K⁺) owing to the matched size of the K⁺ and crown ether cavity, which eventually suppresses the migration of K⁺ and then improving the stability of perovskite solar cells while retaining its excellent passivation effect. Furthermore, 18C6 also plays a crucial role in trap density reduction by mitigating the grain boundaries, passivating the uncoordinated Pb²⁺in the crystals, as witnessed by the SEM images, absorption spectra, carrier lifetime, and chemical bonding information. Ultimately, the short circuit current, open circuit voltage, fill factor, and conversion efficiency are enhanced accompanied with the improved long-term stability and eliminated hysteresis. The champion efficiency of 21.57% is delivered for the 18C6–K⁺ incorporated solar cells, much-leading the control cell without the 18C6–K⁺ incorporation with an efficiency of 20.25%.

通过在电子传输层和钙钛矿吸收层的界面引入钾阳离子-18-冠醚-6 (18C6) 络合物，探索了一种提高钙钛矿太阳能电池效率和稳定性的简便方法。结果表明，由于 K ⁺和冠醚空腔的大小匹配， 18C6 分子可以捕获钾阳离子 (K ^{+ )，最终抑制 K +}的迁移，从而在保持钙钛矿太阳能电池稳定性的同时提高钙钛矿太阳能电池的稳定性。优异的钝化效果。^{此外，18C6 还在通过减少晶界、钝化未配位的 Pb 2+}来降低陷阱密度方面发挥着至关重要的作用在晶体中，如 SEM 图像、吸收光谱、载流子寿命和化学键合信息所证明的那样。最终，短路电流、开路电压、填充因数和转换效率得到提高，同时长期稳定性得到改善并消除了滞后现象。^{掺入 18C6–K +}的太阳能电池实现了 21.57% 的最高效率，远远领先于未掺入 18C6–K ^{+ 的}对照电池，效率为 20.25%。