“…Oligothiophenes with long conjugation lengths, for example, 16-, 20-, and 27-mers, are expected to serve as molecular wires. − In addition, cyclic oligothiophenes and selenium analogues of oligothiophenes , have also been synthesized. Although oligothiophenes are highly crystalline, amorphous molecular materials containing oligothiophenes have been designed and synthesized. − There have been extensive studies on the molecular and crystal structures, and optical, electrochemical, and electrical properties of oligothiophenes − and their applications in OPVs, OLEDs, and OFETs. − …”