[70] PCBM的区域异构体效应对结晶共轭聚合物P3HT的复合膜的膜结构和光伏性能的影响<a href="#fn1" title="提供电子补充信息（ESI）。参见DOI：10.1039 / c7ra08618k">†</a>,RSC Advances

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[70] PCBM的区域异构体效应对结晶共轭聚合物P3HT的复合膜的膜结构和光伏性能的影响 †
RSC Advances ( IF 3.9 ) Pub Date : 2017-09-26 00:00:00 , DOI: 10.1039/c7ra08618k
Tomokazu Umeyama _{1,

2,

3,

4,

5} , Sho Shibata _{1,

2,

3,

4,

5} , Tetsushi Miyata _{1,

2,

3,

4,

5} , Kensho Igarashi _{1,

2,

3,

4,

5} , Tomoyuki Koganezawa _{5,

6,

7} , Hiroshi Imahori _{1,

2,

3,

4,

5}

Affiliation

尽管[6,6]-苯基-C ₇₁普遍存在-丁酸甲酯（[70] PCBM）作为高性能有机光伏（OPV）装置中的电子受体，[70] PCBM通常用作区域异构体的混合物。在这项研究中，我们利用区域异构纯α-和β-[70] PCBM与结晶共轭聚合物供体聚（3-己基噻吩）（P3HT）进行系统地研究了[70] PCBM对结构和电子的区域异构体效应以及复合膜的光伏性能。值得注意的是，β-异构体在共混膜中诱导了P3HT的面对面堆积，而在具有α-异构体和区域异构体混合物的复合膜中，观察到了P3HT的边对边排列（mix- [70] PCBM ）。P3HT：β-[70] PCBM膜在垂直于基板的方向上的空穴迁移率高于P3HT：α-[70] PCBM和P3HT：由于面对面的P3HT包装，因此可以混合使用[70] PCBM。基于优异的空穴迁移率，基于P3HT：β-[70] PCBM膜的OPV器件的功率转换效率比基于其他复合膜的器件（3.11-3.21％）更高，为3.69％。此处获得的结果表明，使用区域异构纯的[70]富勒烯单加合物可以调节共混膜中的聚合物堆积方向，这是提高OPV器件性能的空前方法。

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Regioisomer effects of [70]PCBM on film structures and photovoltaic properties of composite films with a crystalline conjugated polymer P3HT†

Despite the wide prevalence of [6,6]-phenyl-C₇₁-butyric acid methyl ester ([70]PCBM) as an electron acceptor in high-performance organic photovoltaic (OPV) devices, [70]PCBM has been generally used as a mixture of regioisomers. In this study, we utilized regioisomerically pure α- and β-[70]PCBM in combination with a crystalline conjugated polymer donor, poly(3-hexylthiophene) (P3HT) to investigate systematically the regioisomer effects of [70]PCBM on structures and electronic and photovoltaic properties of the composite films. Notably, the β-isomer induced a face-on P3HT packing in the blend film, whereas an edge-on alignment of P3HT was observed in the composite films with the α-isomer as well as the regioisomer mixture (mix-[70]PCBM). The hole mobility in a vertical direction to the substrate in the P3HT:β-[70]PCBM film was higher than those in P3HT:α-[70]PCBM and P3HT:mix-[70]PCBM due to the face-on P3HT packing. Reflecting the superior hole mobility, the OPV device based on the P3HT:β-[70]PCBM film showed a higher power conversion efficiency of 3.69% than the devices based on the other composite films (3.11–3.21%). The results obtained here demonstrate that the use of regioisomerically pure [70]fullerene mono-adducts can modulate the polymer packing direction in the blend film, which is an unprecedented approach to improve the device performances of OPVs.

更新日期：2017-09-26

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