Polymer acceptors for organic solar cells have got increased attention and becoming a strong candidate to replace small molecular electron acceptors. Here, a polymer acceptor (PBDTβNPDI) was constructed with naphthyl substituted asymmetric benzo [1,2-b:4,5-b']dithiophene (BDTβN) as donor unit and simple N,N′-Bis(1-propylbutyl)-1,7-dibromoperylene-3,4:9,10-tetracarbox- diimide (PDI) as acceptor unit. The designed polymer has broad absorption spectrum and tuned aggregation with asymmetric donor unit. Then all-polymer solar cells based on PTBTz-2 electron donor and PBDTβNPDI electron acceptor were prepared. The results exhibit that the device has matched energy levels, complementary absorption spectra, and desirable crystallites and nanoscale phase separation, which result in balanced mobility, low weak bimolecular recombination, and thus obtain a remarkable power conversion efficiency of 6.14% with high short circuit current density of 13.89 mA cm⁻² and decent open circuit voltage of 0.88 V. The results indicate that rational regulation of PDI polymers by asymmetric strategies can obtain ideal polymer accepters, and it has a strong potential to get better results with our in-depth research.

用于有机太阳能电池的聚合物受体越来越受到关注，并成为替代小分子电子受体的有力候选者。在这里，用萘基取代的不对称苯并[1,2- b：4,5- b'以二噻吩（BDTβN）为供体单元，简单的N，N'-双（1-丙基丁基）-1,7-二溴br-3,4：9,10-四甲二酰亚胺（PDI）为受体单元。设计的聚合物具有宽的吸收光谱，并且具有不对称的供体单元，可调节聚集。然后制备了基于PTBTz-2电子给体和PBDTβNPDI电子受体的全聚合物太阳能电池。结果表明，该器件具有匹配的能级，互补的吸收光谱以及令人满意的微晶和纳米级相分离，从而导致了平衡的迁移率，低弱的双分子重组，因此在高短路电流下获得了6.14％的显着功率转换效率密度为13.89 mA cm ^-2 结果表明，通过不对称策略合理调节PDI聚合物可以获得理想的聚合物受体，而且通过深入研究，它有可能获得更好的结果。