Fused terthiophene end-capped with barbituric acid as non-fullerene n-type small molecule for an organic photo-detector.

In this work, a new n-type small molecule consisting of a fused thiophene backbone and barbituric acid as the electron-withdrawing group is reported. For green-selective organic photodiodes, when combined with p-type subphthalocyanine, the external quantum efficiency reached 64% at -3 V, owing to suitable absorption properties, efficient charge separation and relatively good transport.