Byeong Jo Kim, Min-cheol Kim, Hyun Suk Jung, and their team propose a design principle for the electron extraction layer in flexible perovskite solar cells, detailed in article number 1800993. Their approach involves using [6,6]-Phenyl C61 butyric acid methyl ester interfacial treatment to enhance charge collection and reduce interface charge accumulation on the amorphous TiO2 layer. This method simultaneously improves the efficiency, stability, and reliability of flexible perovskite devices. – Journal cover design by scapiens

https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.201870113