Mechanically Robust All-Polymer Solar Cells from Narrow Band Gap Acceptors with Hetero-Bridging Atoms
Mechanically Robust All-Polymer Solar Cells from Narrow Band Gap Acceptors with Hetero-Bridging Atoms
复制标题
具有异质桥接原子的窄带隙受体的机械鲁棒性全聚合物太阳能电池
DOI：
10.1016/j.joule.2020.01.014
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发表时间：
2020-03-18
期刊：
影响因子：
39.8
通讯作者：
Wang, Ergang
中科院分区：
文献类型：
--
作者：
Fan, Qunping;Su, Wenyan;Wang, Ergang
我们开发了三种具有不同桥连原子（即，C、Si和Ge）。研究发现，这种不同的桥连原子显着影响结晶度，消光系数，电子迁移率的聚合物受体，以及相关的活性层的形态和机械鲁棒性。在全聚合物太阳能电池（all-PSC）中，这些聚合物受体实现了超过8.0%的高功率转换效率（PCE），而PF 2-DTSi由于其改善的激子解离、电荷传输和优化的形态而获得了10.77%的最高PCE。此外，PF 2-DTSi基活性层显示出优异的机械鲁棒性，具有9.3 MJ m（-3）的高韧性值和8.6%的大断裂伸长率，这对于柔性器件的实际应用是很大的优势。结果，基于PF 2-DTSi的柔性全PSC在以类似于4 mm的弯曲半径弯曲和松弛1，200次之后保持其初始PCE（6.37%）的>90%。
We developed three narrow band-gap polymer acceptors PF2-DTC, PF2-DTSi, and PF2-DTGe with different bridging atoms (i.e., C, Si, and Ge). Studies found that such different bridging atoms significantly affect the crystallinity, extinction coefficient, electron mobility of the polymer acceptors, and the morphology and mechanical robustness of related active layers. In all-polymer solar cells (all-PSCs), these polymer acceptors achieved high power conversion efficiencies (PCEs) over 8.0%, while PF2-DTSi obtained the highest PCE of 10.77% due to its improved exciton dissociation, charge transport, and optimized morphology. Moreover, the PF2-DTSi-based active layer showed excellent mechanical robustness with a high toughness value of 9.3 MJ m(-3) and a large elongation at a break of 8.6%, which is a great advantage for the practical applications of flexible devices. As a result, the PF2-DTSi-based flexible all-PSC retained >90% of its initial PCE (6.37%) after bending and relaxing 1,200 times at a bending radius of similar to 4 mm.