“Head surgery” of polycyclic o -quinones with cyanated aromatic rings towards high electron mobility acceptors enables 19.6% efficiency in additive-free binary organic solar cells

New acceptors were synthesized via an o -quinone-mediated cycloaromatization strategy. Additive-free organic solar cells with efficiency of 19.6% and organic field effect transistors with electron mobility of 1.1 cm 2 V −1 s −1 were realized.