Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency,Energy & Environmental Science

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Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-1-6 , DOI: 10.1039/d0ee03506h
Gaoda Chai _{1,

2,

3,

4,

5} , Yuan Chang _{1,

2,

3,

4,

5} , Jianquan Zhang _{1,

2,

3,

4,

5} , Xiaopeng Xu _{3,

6,

7,

8,

9} , Liyang Yu _{3,

6,

7,

8,

9} , Xinhui Zou _{1,

2,

3,

4,

5} , Xiaojun Li _{1,

2,

3,

4,

5} , Yuzhong Chen _{1,

2,

3,

4,

5} , Siwei Luo _{1,

2,

3,

4,

5} , Binbin Liu _{3,

10,

11,

12} , Fujin Bai _{1,

2,

3,

4,

5} , Zhenghui Luo _{1,

2,

3,

4,

5} , Han Yu _{1,

2,

3,

4,

5} , Jiaen Liang _{1,

2,

3,

4,

5} , Tao Liu _{1,

2,

3,

4,

5} , Kam Sing Wong _{3,

13,

14,

15} , Hang Zhou _{3,

10,

11,

12} , Qiang Peng _{3,

6,

7,

8,

9} , He Yan _{1,

2,

3,

4,

5}

Affiliation

Hong Kong University of Science and Technology-Shenzhen Research Institute
Nanshan
P. R. China
Department of Chemistry
Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials
School of Chemical Engineering
and State Key Laboratory of Polymer Materials Engineering
Sichuan University
Chengdu 610065
School of Electronic and Computer Engineering
Peking University Shenzhen Graduate School
Shenzhen 518055
Department of Physics
Hong Kong University of Science and Technology
Kowloon

Side-chain engineering has been shown to be an important strategy to optimize Y-series nonfullerene acceptors (NFAs). Most previous reports were focusing on changing the branching positions and size of the alkyl side chains on Y6. In this paper, we investigate the influence of the orientation of side chains on the properties of NFAs and the performance of the organic solar cells (OSCs). Three isomeric NFAs named o-BTP-PhC6, m-BTP-PhC6, and p-BTP-PhC6 are designed by changing the substitution positions and thus orientations of the side chains attached to the central core. Our studies show that the optimal side-chain orientation can be achieved by the meta-positioned hexylphenyl group (of the m-BTP-PhC6 molecule), which introduces significant beneficial effects on optical absorption, intermolecular packing and phase separation of the NFAs. By pairing a donor polymer PTQ10 with m-BTP-PhC6, device efficiencies of 17.7% can be achieved, which is among the best values for PTQ10-based nonfullerene OSC devices so far. These results reveal that regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility and solar cell performances.

中文翻译：

对非富勒烯受体上的侧链方向进行微调，可使有机太阳能电池的效率达到17.7％

侧链工程已被证明是优化Y系列非富勒烯受体（NFA）的重要策略。以前的大多数报道都集中于改变Y6烷基侧链的支化位置和大小。在本文中，我们研究了侧链取向对NFAs性能和有机太阳能电池（OSCs）性能的影响。通过改变取代位置以及连接到中心核的侧链的方向，设计了三个异构的NFA，分别命名为o -BTP-PhC6，m -BTP-PhC6和p -BTP-PhC6。我们的研究表明，最佳侧链取向可以由能够实现元-positioned己基苯基（的米-BTP-PhC6分子），对NFA的光吸收，分子间堆积和相分离产生重大的有益影响。通过将供体聚合物PTQ10与m -BTP-PhC6配对，可以实现17.7％的器件效率，这是迄今为止基于PTQ10的非富勒烯OSC器件的最佳值。这些结果表明，调节Y系列NFA的侧链取向是实现良好形态，高电荷迁移率和太阳能电池性能的有前途的策略。

更新日期：2021-02-05

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