Fluorination on cyclopentadithiophene-based hole-transport materials for high-performance perovskite solar cells

A new class of fluorinated cyclopenta[2,1- b :3,4- b ′]dithiophene (CPDT)-based small molecules, namely YC-oF, YC-mF, and YC-H, are demonstrated as hole-transporting materials (HTMs) for high-performance perovskite solar cells (PSCs).