Two Birds with One Stone: High Efficiency and Low Synthetic Cost for Benzotriazole‐Based Polymer Solar Cells by a Simple Chemical Approach,Advanced Energy Materials

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Two Birds with One Stone: High Efficiency and Low Synthetic Cost for Benzotriazole‐Based Polymer Solar Cells by a Simple Chemical Approach
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-09-03 , DOI: 10.1002/aenm.202002142
Xiaonan Xue ₁ , Bing Zheng ₁ , Yu Zhang ₁ , Ming Zhang ₂ , Donghui Wei ₃ , Feng Liu ₂ , Meixiu Wan ₁ , Juan Liu ₁ , Guangming Chen ₄ , Lijun Huo ₁

Affiliation

Low synthetic cost and high performance are becoming a new challenge in designing polymer donors for large‐scaled polymer solar cells (PSCs) fabrication; however, complicated synthetic routes and high material costs hamper the widespread commercial application of OPVs. Here, a simple and low‐cost chemical steric effect (SE) is introduced to BDT‐based side chains. Through adjusting alkyl side chains, the polymeric crystallinity and miscibility are rebalanced and subsequently the photovoltaic device based on the meta‐positioned alkyl polymer outperforms its para‐positioned counterpart. The champion device based on the polymer with the meta‐positioned side chains affords a PCE of 14.53% without sacrificing its high fill factor of 0.77, which could be attributed to a more balanced charge‐carrier transport ability and optimized morphology. This is the highest PCE value reported in BTZ based polymer donors to date. Thus, it shows that the SE applied in high crystalline polymer could pave an easier and cheaper chemical route to realize the coordination of low‐cost fabrication and high‐performance.

中文翻译：

两只鸟只有一块石头：通过简单的化学方法，基于苯并三唑的聚合物太阳能电池效率高且合成成本低

在为大规模聚合物太阳能电池（PSC）制造设计聚合物供体时，低合成成本和高性能正成为新的挑战。然而，复杂的合成路线和高昂的材料成本阻碍了OPV的广泛商业应用。在此，基于BDT的侧链引入了一种简单且低成本的化学位阻效应（SE）。通过调节烷基侧链，可重新平衡聚合物的结晶度和可混溶性，随后基于间位烷基聚合物的光伏器件的性能优于对位聚合物。以具有间位侧链的聚合物为基础的冠军设备可提供14.53％的PCE，而不会牺牲其0.77的高填充因子，这可归因于更平衡的电荷载流子传输能力和优化的形态。这是迄今为止基于BTZ的聚合物供体中报道的最高PCE值。因此，表明在高结晶度聚合物中应用SE可以为实现低成本制造与高性能的协调铺平一条更容易，更便宜的化学路线。

更新日期：2020-10-20

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