Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector

Organic solar cells (OSCs) exhibit complex charge dynamics, which are closely correlated with the dielectric constant (?r) of photovoltaic materials. Here we design and synthesize a series of novel conjugated copolymers based on benzo[1,2?b:4,5?b’]difuran (BDF) and benzotriazole (BTz), which differ by the nature of ??bridge from one another. The PBDF?TF?BTz with asymmetric furan and thiophene ??bridge demonstrates a larger ?r of 4.22 than PBDF?dT?BTz with symmetric thiophene ??bridge (3.15) and PBDF?dF?BTz with symmetric furan ??bridge (3.90). The PBDF?TF?BTz also offers more favorable molecular packing and appropriate miscibility with non?fullerene acceptor Y6 than its counterparts. The corresponding PBDF?TF?BTz:Y6 OSCs display efficient exciton dissociation, fast charge transport and collection, and reduced charge recombination, eventually leading to a power conversion efficiency of 17.01%. When introducing a fullerene derivative (PCBO?12) as a third component, the PBDF?TF?BTz:Y6:PCBO?12 OSCs yield a remarkable FF of 80.11% with a high efficiency of 18.10%, the highest value among all reported BDF polymer?based OSCs. Our work provides an effective approach to developing high?permittivity photovoltaic materials, showcasing PBDF?TF?BTz as a promising polymer donor for constructing high?performance OSCs.This article is protected by copyright. All rights reserved

» Publication Date: 13/09/2023

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