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Enhancing the photovoltaic performance of binary acceptor-based conjugated polymers incorporating methyl units

机译：增强掺入甲基单元的二元受体的共轭聚合物的光伏性能

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Three conjugated polymers incorporating pentacyclic lactam (PCL) and diketopyrrolopyrrole (DPP) units into conjugated polymers were designed and synthesized, in which the aromatic linkers between PCL and DPP varied from thiophene to methylthiophene. Methylated polymers were found to show slightly blue-shift absorption and high-lying energy levels compared to non-methylated polymers. The three polymers also exhibit good crystalline properties and hole mobilities up to 0.57 cm ~(2) V ~(?1) s ~(?1) in field-effect transistors. Non-methylated polymers as electron donors in solar cells show an efficiency of 4.2% with a relatively low short circuit current density ( J _(sc) ) of 8.3 mA cm ~(?2) , while methylated polymers exhibit dramastically enhanced J _(sc) of 12.8 mA cm ~(?2) and PCEs up to 6.1%. Micro-phase separation in bulk-heterojunction thin films were systematically investigated, in which methylated polymers in blended thin films were found to provide better micro-phase separation with small crystal domain. The observation can explain their improved photocurrent in solar cells. Our studies demonstrate that by intentionally structural modification, conjugated polymers containing several electron-deficient units can have the great potential application in high performance solar cells.
机译：设计并合成将三种缀合的聚合物掺入螯合内酰胺（PCL）和二酮吡咯唑（DIKETOPWROLOLOLOLOLE（DIKETOPWROLOLOLOLOLE（DIKETOPWROLOLOLOLOLE（DIKETOPWROLOLOLOLE（DPP）单元，其中PCL和DPP之间的芳族接头从噻吩变为甲基噻吩。与非甲基化聚合物相比，发现甲基化聚合物显示出略微蓝移吸收和高位能水平。三种聚合物在场效应晶体管中表现出高达0.57cm〜（2）V〜（α1）的孔阶段的良好结晶性能和孔迁移率。作为太阳能电池的电子供体的非甲基化聚合物显示出4.2％的效率，其短路电流密度（J _（Sc））为8.3 mA cm〜（α2），而甲基化聚合物表现出显着增强的J _（ Sc）12.8 mA cm〜（？2），PCE高达6.1％。系统地研究了体外杂交薄膜中的微相分离，其中发现混合薄膜中的甲基化聚合物提供了具有小晶结构域的更好的微相分离。观察结果可以在太阳能电池中解释它们改善的光电流。我们的研究表明，通过故意结构改性，含有几个电子缺陷单元的共轭聚合物可以具有高性能太阳能电池的巨大潜在应用。

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