“…Thus, several donor-acceptor polymers, such as D-D-A and A-A-D, have been developed and reported in recent years. [15][16][17][18][19][20][21][22] Different electron-deficient units, such as benzothiadiazole, diketopyrrolopyrrole (DPP), perylene diimine, and naphthalene diimide, are commonly used in donor-acceptor polymers. Among them, the DPP unit is one of the most promising due to its easy chemical modification for tuning the optoelectronic properties, crystalline nature, wide absorption, narrow band gap and high charge mobility.…”