Can Ferroelectricity Improve Organic Solar Cells?,Macromolecular Rapid Communications

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Can Ferroelectricity Improve Organic Solar Cells?
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-05-05 , DOI: 10.1002/marc.202000124
Mustapha Abdu-Aguye ₁ , Nutifafa Y Doumon _{1,

2,

3} , Ivan Terzic ₄ , Jingjin Dong ₄ , Giuseppe Portale ₄ , Katja Loos ₄ , L Jan Anton Koster ₁ , Maria Antonietta Loi ₁

Affiliation

Blends of semiconducting (SC) and ferroelectric (FE) polymers have been proposed for applications in resistive memories and organic photovoltaics (OPV). For OPV, the rationale is that the local electric field associated with the dipoles in a blend could aid exciton dissociation, thus improving power conversion efficiency. However, FE polymers either require solvents or processing steps that are incompatible with those required for SC polymers. To overcome this limitation, SC (poly(3‐hexylthiophene)) and FE (poly(vinylidene fluoride‐trifluoroethylene)) components are incorporated into a block copolymer and thus a path to a facile fabrication of smooth thin films from suitably chosen solvents is achieved. In this work, the photophysical properties and device performance of organic solar cells containing the aforementioned block copolymer consisting of poly(vinylidene fluoride‐trifluoroethylene): P(VDF‐TrFE), poly(3‐hexylthiophene): P3HT and the electron acceptor phenyl‐C₆₁‐butyric acid methyl ester: [60]PCBM are explored. A decrease in photovoltaic performance is observed in blends of the copolymer with P3HT:[60]PCBM, which is attributed to a less favorable nanomorphology upon addition of the copolymer. The role of lithium fluoride (the cathode modification layer) is also clarified in devices containing the copolymer, and it is demonstrated that ferroelectric compensation prevents the ferroelectricity of the copolymer from improving photovoltaic performance in SC‐FE blends.

中文翻译：

铁电能改善有机太阳能电池吗？

已提出将半导体（SC）和铁电（FE）聚合物的共混物用于电阻式存储器和有机光伏（OPV）。对于OPV，其理由是与共混物中的偶极子相关的局部电场可以帮助激子解离，从而提高功率转换效率。但是，FE聚合物需要的溶剂或加工步骤与SC聚合物所需的溶剂或加工步骤不兼容。为了克服这种限制，SC（聚（3-己基噻吩））和Fe（聚（偏二氟乙烯 - 三氟））组件可以被合并成块共聚物，从而从适当选择的溶剂光滑薄膜的容易制造的路径被实现。在这项工作中_61-丁酸甲酯：[60] PCBM。在共聚物与P3HT：[60] PCBM的共混物中观察到光伏性能下降，这归因于加入共聚物后纳米形态的降低。氟化锂（阴极改性层）在含共聚物的装置中的作用也得到了阐明，证明了铁电补偿会阻止共聚物的铁电改善SC-FE共混物中的光伏性能。

更新日期：2020-05-05

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