Suppressing Co‐Crystallization of Halogenated Non‐Fullerene Acceptors for Thermally Stable Ternary Solar Cells,Advanced Functional Materials

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Suppressing Co‐Crystallization of Halogenated Non‐Fullerene Acceptors for Thermally Stable Ternary Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-13 , DOI: 10.1002/adfm.202005462
Sandra Hultmark ₁ , Sri Harish Kumar Paleti ₂ , Albert Harillo ₃ , Sara Marina _{4,

5} , Ferry Anggoro Ardy Nugroho ₆ , Yanfeng Liu ₇ , Leif K. E. Ericsson ₈ , Ruipeng Li ₉ , Jaime Martín _{4,

5} , Jonas Bergqvist ₇ , Christoph Langhammer ₆ , Fengling Zhang ₇ , Liyang Yu ₁₀ , Mariano Campoy‐Quiles ₃ , Ellen Moons ₈ , Derya Baran ₂ , Christian Müller ₁

Affiliation

Department of Chemistry and Chemical Engineering Chalmers University of Technology Göteborg 41296 Sweden
King Abdullah University of Science and Technology (KAUST) Division of Physical Sciences and Engineering and KAUST Solar Center (KSC) Thuwal 23955‐6900 Saudi Arabia
Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) Campus de la UAB Bellaterra 08193 Spain
POLYMAT and Polymer Science and Technology Department Faculty of Chemistry University of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 Donostia‐San Sebastián 20018 Spain
Ikerbasque Basque Foundation for Science Bilbao 48013 Spain
Department of Physics Chalmers University of Technology Göteborg 41296 Sweden
Department of Physics Chemistry and Biology (IFM) Linköping University Linköping 58183 Sweden
Department of Engineering and Physics Karlstad University Karlstad 65188 Sweden
National Synchrotron Light Source II Brookhaven National Laboratory New York NY 11973 USA
Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China

While photovoltaic blends based on non‐fullerene acceptors are touted for their thermal stability, this type of acceptor tends to crystallize, which can result in a gradual decrease in photovoltaic performance and affects the reproducibility of the devices. Two halogenated indacenodithienothiophene‐based acceptors that readily co‐crystallize upon mixing are studied, which indicates that the use of an acceptor mixture alone does not guarantee the formation of a disordered mixture. The addition of the donor polymer to the acceptor mixture readily suppresses the crystallization, which results in a fine‐grained ternary blend with nanometer‐sized domains that do not coarsen due to a high T_g ≈ 200 °C. As a result, annealing at temperatures of up to 170 °C does not markedly affect the photovoltaic performance of ternary devices, in contrast to binary devices that suffer from acceptor crystallization in the active layer. The results indicate that the ternary approach enables the use of high‐temperature processing protocols, which are needed for upscaling and high‐throughput fabrication of organic solar cells. Further, ternary devices display a stable photovoltaic performance at 130 °C for at least 205 h, which indicates that the use of acceptor mixtures allows to fabricate devices with excellent thermal stability.

中文翻译：

抑制热稳定的三元太阳能电池卤代非富勒烯受体的共结晶

尽管吹捧基于非富勒烯受体的光伏混合物具有热稳定性，但这种类型的受体往往会结晶，这会导致光伏性能逐渐下降并影响设备的可重复性。研究了两种基于卤化茚并二噻吩并噻吩的受体，它们在混合时容易共结晶，这表明仅使用受体混合物并不能保证形成无序混合物。将施主聚合物添加到受体混合物中很容易抑制结晶，这导致了具有纳米级结构域的细粒度三元共混物，由于高T _g而不会粗化≈200°C。结果，与在有源层中受主结晶的二元器件相反，在高达170°C的温度下退火不会明显影响三元器件的光伏性能。结果表明，三元方法可以使用高温处理协议，这对于有机太阳能电池的放大和高通量制造是必需的。此外，三元器件在130°C的环境中至少显示205 h具有稳定的光伏性能，这表明使用受体混合物可制造出具有出色热稳定性的器件。

更新日期：2020-11-25

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