Modulation of terminal alkyl chain length enables over 15% efficiency in small-molecule organic solar cells

被引：0
|
作者：
Qianglong Lv
Cunbin An
Tao Zhang
Jianqi Zhang
Shaoqing Zhang
Pengxin Zhou
Chang He
Jianhui Hou
机构：
[1] Chinese Academy of Sciences,Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry
[2] Northwest Normal University,College of Chemistry and Chemical Engineering
[3] National Center for Nanoscience and Technology,Key Laboratory of Nanosystem and Hierarchical Fabrication
[4] University of Chinese Academy of Sciences,undefined
来源：
Science China Chemistry | 2021年 / 64卷
关键词：
small-molecule donor; non-fullerene acceptor; intermolecular interaction; terminal alkyl chain; small-molecule organic solar cells;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In small-molecule organic solar cells (SM-OSCs), it remains a big challenge to obtain favorable bulk heterojunction morphology by donor material design. Herein, we design and synthesize three small-molecule donors BPF3T-C4, BPF3T-C6 and BPF3T-C8, with different terminal alkyl chains. Although they possess similar absorption profiles and molecular energy levels, their crystallinity gradually decreases with the chain length of the terminal alkyl chains. After blending with an electron acceptor of BO-4Cl, the crystallinity and packing orientations of these donors are suppressed and changed from edge-on to face-on. Simultaneously, the crystallinity of BO-4Cl gradually weakens with the chain length of the terminal alkyl chain of donor materials. Finally, The BPF3T-C6 with moderate crystallinity exhibits the best phase-separation morphology among these blend films. As a result, the BPF3T-C6:BO-4Cl-based SM-OSC shows an impressive power conversion efficiency of 15.1%. [graphic not available: see fulltext]
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页码：1200 / 1207
页数：7
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