Two new polymers were made by inserting DPPD unit on P(BDT-TDPPDT) and P(BDTT-TDPPDT).
The property modulation of the new polymers was systematically examined.
New polymers showed higher band gaps than those of the original polymers.
New polymers showed similar HOMO levels with those of the original polymers.
New polymers showed improved morphology when blended with PC70BM.