Title: Cover Feature: Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells (Chem. Eur. J. 13/2019).
Authors: Vidal, Sara; Izquierdo, Marta; Filippone, Salvatore; Fernández, Israel; Akin, Seckin; Seo, Ji‐Youn; Zakeeruddin, Shaik M.; Grätzel, Michael; Martín, Nazario
Abstract: Solvent polarity decides! β‐[70]‐PCFM fullerenes ([6,6]‐Phenyl‐C61‐Formic acid Methyl ester) are formed as the major product in the reaction of C70 with sulfonium salts, affording a mixture of α‐ and β‐site isomers in good yields. Amazingly, the preference for the α‐ or β‐site isomer can be efficiently controlled by means of the solvent polarity! [70]PCFMs are very efficient in passivating the voids/pin‐holes and/or deep slits in bulk heterojunction perovskite solar cells, with efficiencies around 20 %, depending on the isomeric fullerene composition. More information can be found in the Communication by S. M. Zakeeruddin, M. Grätzel, N. Martín, et al. on page 3224.
Subjects: FULLERENES; SOLVENTS; POLARITY (Chemistry)
Publication: Chemistry - A European Journal, 2019, Vol 25, Issue 13, p3144
ISSN: 0947-6539
Publication type: Academic Journal
DOI: 10.1002/chem.201900574

Cover Feature: Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells (Chem. Eur. J. 13/2019).

Vidal, Sara; Izquierdo, Marta; Filippone, Salvatore; Fernández, Israel; Akin, Seckin; Seo, Ji‐Youn; Zakeeruddin, Shaik M.; Grätzel, Michael; Martín, Nazario