A novel wide‐bandgap electron‐donating copolymer containing an electron‐deficient, difluorobenzotriazole building block with a siloxane‐terminated side chain is developed. The resulting polymer, poly{(4,8‐bis(4,5‐dihexylthiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐co‐4,7‐di(thiophen‐2‐yl)‐5,6‐difluoro‐2‐(6‐(1,1,1,3,5,5,5‐heptamethyltri‐siloxan‐3‐yl)hexyl)‐2H‐benzo[d][1,2,3]triazole} (PBTA‐Si), is used to successfully fabricate high‐performance, ternary, all‐polymer solar cells (all‐PSCs) insensitive to the active layer thickness. An impressively high fill factor of ≈76% is achieved with various ternary‐blending ratios. The optimized all‐PSCs attain a power conversion efficiency (PCE) of 9.17% with an active layer thickness of 350 nm and maintain a PCE over 8% for thicknesses over 400 nm, which is the highest reported efficiency for thick all‐PSCs. These results can be attributed to efficient charge transfer, additional energy transfer, high and balanced charge transport, and weak recombination behavior in the photoactive layer. Moreover, the photoactive layers of the ternary all‐PSCs are processed in a nonhalogenated solvent, 2‐methyltetrahydrofuran, which greatly improves their compatibility with large‐scale manufacturing.

中文翻译：

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通过新型宽带隙电子定性共聚物的三元共混形成高性能厚膜全聚合物太阳能电池

开发了一种新型的宽带隙给电子共聚物，该共聚物包含缺电子的二氟苯并三唑结构单元，该结构单元带有硅氧烷封端的侧链。生成的聚合物聚{（4,8-双（4,5-二己基噻吩-2-基）苯并[1,2-b：4,5-b']二噻吩-co-4,7-二（噻吩- 2−yl）‐5,6‐difluoro‐2‐（6-（1,1,1,3,5,5,5,5-庚基甲基三硅氧烷‐3‐yl）己基）‐2H‐苯并[d] [1 ，2,3] triazole}（PBTA-Si）用于成功地制造对有源层厚度不敏感的高性能三元全聚合物太阳能电池（all-PSC），其高填充系数高达≈76％经过优化的全PSC可以实现9.17％的功率转换效率（PCE），有效层厚度为350 nm，并且对于超过400 nm的厚度，PCE保持8％以上，这是最高的报告了厚全PSC的效率。这些结果可以归因于有效的电荷转移，附加的能量转移，高和平衡的电荷转移以及在光敏层中的弱复合行为。此外，三元全PSC的光敏层是在非卤代溶剂2-甲基四氢呋喃中加工的，这大大提高了它们与大规模生产的相容性。