Enantiomerically Pure Fullerenes as a Means to Enhance the Performance of Perovskite Solar Cells

The rapidly advancing improvements in perovskite solar cells (PSCs) are driven, part, by the inclusion of suitable electron transport layers (ETLs) high performance devices. Fullerene derivatives particularly useful ETLs PSCs, but many utilized fullerenes present as isomeric mixtures. opportunities presented single-isomer, single-enantiomer PSCs poorly understood. Here, inverted prepared using bis[60]phenyl-C61-butyric acid methyl ester derivative (anti)16,17-bis[60]PCBM, comparing enantiomerically pure material to corresponding racemate. single enantiomer devices found have an improved performance, giving a power conversion efficiency (PCE) 23.2%, compared 20.1% PCE for It is also shown that PSC modules can be with state-of-the-art 20.1%. Such excellent accompanied enhanced operational stability. This study thus provides strong evidence isomer provide important and it positions chiral exciting class moving forward.