异构化对高性能非富勒烯电子受体的影响。
Effect of Isomerization on High-Performance Nonfullerene Electron Acceptors.
作者信息
Wang Jiayu, Zhang Junxiang, Xiao Yiqun, Xiao Tong, Zhu Runyu, Yan Cenqi, Fu Youquan, Lu Guanghao, Lu Xinhui, Marder Seth R, Zhan Xiaowei
机构信息
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education , Peking University , Beijing 100871 , China.
School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics , Georgia Institute of Technology , Atlanta , Georgia 30332-0400 , United States.
出版信息
J Am Chem Soc. 2018 Jul 25;140(29):9140-9147. doi: 10.1021/jacs.8b04027. Epub 2018 Jul 17.
We design and synthesize two isomeric fused-ring electron acceptors, FNIC1 and FNIC2, which have the same end-groups and side-chains, but isomeric fused-nine-ring cores. Subtle changes in the two isomers influence their electronic, optical, charge-transport, and morphological properties. As compared with FNIC1, FNIC2 film exhibits a red-shifted absorption peak at 794 nm (752 nm for FNIC1), larger electron affinity of 4.00 eV (3.92 eV for FNIC1), smaller ionization energy of 5.56 eV (5.61 eV for FNIC1), and higher electron mobility of 1.7 × 10 cm V s (1.2 × 10 cm V s for FNIC1). The as-cast organic solar cells based on PTB7-Th:FNIC2 blends exhibit a power conversion efficiency (PCE) of 13.0%, which is significantly higher than that of PTB7-Th:FNIC1-based devices (10.3%). Semitransparent devices based on PTB7-Th:FNIC2 blends exhibit PCEs varying from 9.51% to 11.6% at different average visible transmittance (AVT, 20.3- 13.6%), significantly higher than those of PTB7-Th:FNIC1-based devices (7.58-9.14% with AVT of 20.2- 14.7%).
我们设计并合成了两种异构稠环电子受体，FNIC1和FNIC2，它们具有相同的端基和侧链，但稠九环核心异构。这两种异构体的细微变化影响了它们的电子、光学、电荷传输和形态性质。与FNIC1相比，FNIC2薄膜在794nm处表现出红移吸收峰（FNIC1为752nm），更大的电子亲和力为4.00eV（FNIC1为3.92eV），更小的电离能为5.56eV（FNIC1为5.61eV），以及更高的电子迁移率为1.7×10cm²V⁻¹s⁻¹（FNIC1为1.2×10cm²V⁻¹s⁻¹）。基于PTB7-Th:FNIC2共混物铸膜的有机太阳能电池表现出13.0%的功率转换效率（PCE），显著高于基于PTB7-Th:FNIC1器件的效率（10.3%）。基于PTB7-Th:FNIC2共混物的半透明器件在不同平均可见光透射率（AVT，20.3 - 13.6%）下的PCE在9.51%至11.6%之间变化，显著高于基于PTB7-Th:FNIC1器件的效率（AVT为20.2 - 14.7%时为7.58 - 9.14%）。
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