A novel benzodifuran (BDF)-based polymer (PDiFPBDF-TBz, F13) was designed and synthesized for non-fullerene polymer solar cells with the impressive power conversion efficiencies of up to 13.34% and improved stabilities.
In this work, two novel two-dimensional (2D) benzo[1,2-b:4,5-b′]difuran (BDF)-based wide bandgap polymers were designed using a halogenation strategy by incorporating fluorine- and chlorine-substituted conjugated side chains, respectively.
The ambient stability and processability of organic solar cells (OSCs) are important factors for their commercialization. Herein, we selected four benzo [1,2-b:4,5-b′]difuran (BDF) polymers and two electron acceptors to examine the role of photovoltaic materials in the ambient stability. The investigations revealed that the MoO x layer is the detrimental factor for the ambient stabilities. The penetration of MoO x into the active layer and their interactions will strengthen the interface and form a favorable contact, hence leading to the increased photovoltaic performance, in which the efficiency loss induced by air was balanced out. As such, these BDF polymer-based non-fullerene (NF) OSCs possessed very promising ambient stabilities even after ∼1000 h with the almost maintained power conversion efficiencies (PCEs). These results drive us to further investigate the ambient processability of these NF−OSCs. The PCEs from the devices processed under ambient condition only possessed 0.3−2% loss compared to those devices under inert conditions, which suggest the significant potentials of BDF polymers to develop highly efficient and stable NF−OSCs for the practical applications.
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