In this work, we designed and synthesized a novel naphthalenediimide-based n-type conjugated polymer PNDICI, which bears asymmetric backbone containing a 3-chlorothiophene unit. The asymmetric structure associated with steric effects of the chlorine atom imparts remarkable solubility to PNDICI in various organic solvents, enabling the fabrication of all-polymer solar cells (all-PSCs) by using an environmentally friendly solvent of d-limonene. Combined with a novel pyrrolo[3,4-f]benzotriazole-5,7(6H)-dione based p-type conjugated polymer P2F-Si with deep highest occupied molecular orbital energy level, the resulting d-limonene-processed all-PSCs presents an impressively high open-circuit voltage of approaching 1.0 V, corresponding to a very small energy loss of 0.49 eV. Through further morphology optimization by using γ-valerolactone, we demonstrated an impressive device efficiency of 4.2%, which is among the best photovoltaic performance of devices processed using d-limonene and comparable to that processed by conventional solvent, suggesting the great promise of using greener solvent for fabricating high-performance all-PSCs.

在这项工作中，我们设计并合成了一种新型的萘二甲酰亚胺基n型共轭聚合物PNDICI，该聚合物带有不对称的骨架，含有3-氯噻吩单元。与氯原子的空间效应有关的不对称结构使PNDICI在各种有机溶剂中具有显着的溶解性，从而能够通过使用环境友好的d-柠檬烯溶剂制造全聚合物太阳能电池（all-PSC）。与新型的吡咯并[3,4- f ]苯并三唑-5,7（6 H）-二酮基p型共轭聚合物P2F-Si具有较高的最高分子轨道能级，从而得到d经柠檬烯处理的全PSC的开路电压非常高，接近1.0 V，相当于0.49 eV的很小的能量损耗。通过使用γ-戊内酯进行进一步的形态优化，我们证明了4.2％的器件效率令人印象深刻，这是使用d-柠檬烯加工的器件的最佳光伏性能之一，可与传统溶剂加工的器件相媲美，这表明使用更绿色的器件具有广阔的前景用于制造高性能全PSC的溶剂。