Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization

Min Deng; Xiao-Peng Xu; Li-Yang Yu; Rui-Peng Li; Qiang Peng

doi:10.1007/s10118-022-2751-z

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Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization

RESEARCH ARTICLE | Updated：2022-07-21

- Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization
- Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization
- Chinese Journal of Polymer Science 2022年40卷第8期页码：928-936
- Affiliations：
  
  a.School of Chemical Engineering, Key Laboratory of Green Chemistry and Technology of Ministry of Education and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
  b.National Synchrotron Light Source II, Brookhaven National Lab, Suffolk, Upton NY 11973, USA
- Author bio：
  
  xpxu@scu.edu.cn (X.P.X.)
  qiangpeng@scu.edu.cn (Q.P.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 21825502, 22075190, 21905185 and 22105135), Special funds for local science and technology development guided by the central government (No. 2020ZYD004), the Foundation of State Key Laboratory of Polymer Materials Engineering (No. SKLPME 2017-2-04) and the Fundamental Research Funds for the Central Universities. The authors thank Yanping Huang from Center of Engineering Experimental Teaching, School of Chemical Engineering, Sichuan University for the help of NMR measurements. The authors also thank National Synchrotron Light Source II (NSLS-II, Contract No. DE-SC0012704) Brookhaven National Laboratory for providing GIWAXS experiment time.
- DOI：10.1007/s10118-022-2751-z
  中图分类号：
- 收稿：2022-02-28，
  
  修回：2022-3-30，
  
  录用：2022-4-2，
  
  网络首发：2022-06-22，
  
  纸质出版：2022-08-01
- Accepted：
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Deng, M.; Xu, X. P.; Yu, L. Y.; Li, R. P.; Peng, Q. Lowly fused non-fullerene acceptors towards efficient organic solar cells enabled by isomerization. Chinese J. Polym. Sci. 2022, 40, 928–936

Min Deng, Xiao-Peng Xu, Li-Yang Yu, et al. Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization[J]. Chinese Journal of Polymer Science, 2022, 40(8): 928-936.
Deng, M.; Xu, X. P.; Yu, L. Y.; Li, R. P.; Peng, Q. Lowly fused non-fullerene acceptors towards efficient organic solar cells enabled by isomerization. Chinese J. Polym. Sci. 2022, 40, 928–936 DOI： 10.1007/s10118-022-2751-z.

Min Deng, Xiao-Peng Xu, Li-Yang Yu, et al. Lowly Fused Non-Fullerene Acceptors Towards Efficient Organic Solar Cells Enabled by Isomerization[J]. Chinese Journal of Polymer Science, 2022, 40(8): 928-936. DOI： 10.1007/s10118-022-2751-z.

摘要

Two lowly fused NFAs were developed by tailoring the fused 7-ring central core of Y6 into a lowly fused 5-ring with two octyloxythiophene bridges to form the isomeric structures and tune the overall properties

which improved the PCE form 0.97% of BTP-in-4F based devices to 13.32% of BTP-out-4F based devices.

Abstract

Two lowly fused non-fullerene acceptors (NFAs) with isomeric structures

named as BTP-out-4F and BTP-in-4F

were developed by tailoring the fused 7-ring central core of Y6 into a lowly fused 5-ring linked with two octyloxythiophene bridges. BTP-out-4F with octyloxy side chains away from the central core exhibited large steric hindrance that restrained the rotational freedom between the thiophene bridge and end group but maintained free rotation between the central core and the thiophene bridge. In contrast

BTP-in-4F with octyloxy side chains close to the central core had much lower rotation freedom due to the non-covalent S···O interactions locked the central core

thiophene bridge and end group simultaneously

making BTP-in-4F have higher molecular crystallinity. On the other hand

the optical properties

energy levels and the blend morphology properties were significantly influenced

leading to distinctive photovoltaic performances. BTP-out-4F formed favorable energy level alignment and morphology when matching with PBDB-T donor

thus its device realized a much higher PCE of 13.32%

which was over 13 times than that of BTP-in-4F based device (PCE=0.97%).

关键词

Keywords

references

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