Synthesis and photophysical properties of organic photovoltaic polymer donor materials based on BDT-THSEH

The electron-donating fragment BDT-TSEH-Sn was synthesized from benzodithiophene containing thiophene sulfur side chain. The electron-absorbing fragment 2Br-TBO-DTBT was synthesized from the fragment containing benzodithiophene. Then, a polymer donor named PBDTTSEH-DTBT with a linear two-dimensional conjugated was synthesized by Still coupling reaction. A strong push-pull exists between BDT-TSEH and DTBT. The molecular weight of PBDTTSEH-DTBT was determined by GPC. PBDTTSEH-DTBT could be dissolved well in general organic solvents. The polymer donor has a wide absorption spectrum which can match well with most of the acceptors to get high-efficiency OSCs.