Donor-acceptor polymers based on multi-fused heptacyclic structures: synthesis, characterization and photovoltaic applications

摘要

We report here two novel 2,7-fluorene- and 2,7-carbazole-based conjugated polymers PFDCTBT and PCDCTBT containing ladder-type heptacyclic structures with forced planarity. PCDTBT shows excellent solubility, low band gap and high hole mobility, leading to a power conversion efficiency of 3.7%.rnOver the past few years, tremendous research effort has been made on all-solution processed polymer solar cells (PSCs) in order to realize low-cost, light-weight, large-area and flexible photovoltaic devices. PSCs based on the concept of bulk heterojunction (BHJ) are the most widely adopted device architecture to ensure maximum internal donor-acceptor (D-A) interfacial area for efficient charge separation.