Low-bandgap polymer electron acceptors based on double B <- N bridged bipyridine (BNBP) and diketopyrrolopyrrole (DPP) units for all-polymer solar cells

作者：Long, Xiaojing; Wang, Ning; Ding, Zicheng; Dou, Chuandong^*; Liu, Jun^*; Wang, Lixiang

来源：Journal of Materials Chemistry C, 2016, 4(42): 9961-9967.

DOI：10.1039/c6tc03652j

• POWER CONVERSION EFFICIENCY
• CONJUGATED POLYMERS
• BLEND MORPHOLOGY
• DONOR
• AGGREGATION
• MOBILITY
• ORIENTATION
• COPOLYMER
• FIELD

Broad absorption spectra and small optical bandgaps of polymer electron acceptors are very important for the sunlight harvesting of all-polymer solar cells (all-PSCs). Conjugated polymers based on the double B <- N bridged bipyridine (BNBP) unit are a new class of polymer electron acceptors, which suffer from narrow absorption spectra and large bandgaps. In this manuscript, we report a new polymer electron acceptor (P-BNBP-DPP) based on the BNBP unit and the dithienyl-diketopyrrolopyrrole (DPP) unit with a small bandgap and improved sunlight-harvesting capability. P-BNBP-DPP exhibits a broad absorption band with the onset absorbance at 796 nm and a small optical bandgap of 1.56 eV. Moreover, P-BNBP-DPP shows the low LUMO/HOMO energy levels of -3.87 eV/-5.45 eV and a high electron mobility of 2.1 x 10(-4) cm(2) V-1 s(-1). An all-PSC device with P-BNBP-DPP as the acceptor and poly[(ethylhexyl-oxy)-benzodithiophene-(ethylhexyl)-thienothiophene] (PTB7) as the donor produces a power conversion efficiency of 2.69% with a broad external quantum efficiency response in the range of 300-800 nm. These results suggest an effective approach to tune the absorption spectra of BNBP-based polymer electron acceptors.