Subtle Effect of Alkyl Substituted <italic style="font-style: italic">π</italic>-Bridges on Dibenzo[<italic style="font-style: italic">a</italic>,<italic style="font-style: italic">c</italic>]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance

Chun-Xian Ke; Xue Lai; Heng-Tao Wang; Ming-Rui Pu; Tahir Rehman; Yu-Lin Zhu; Feng He

doi:10.1007/s10118-022-2719-z

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Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance

RESEARCH ARTICLE | Updated：2022-07-21

- Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance
- Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance
- Chinese Journal of Polymer Science 2022年40卷第8期页码：889-897
- Affiliations：
  
  a.Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
  b.Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- Author bio：
  
  hef@sustech.edu.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 21733005 and 21975115), the Shenzhen Fundamental Research Program (Nos. JCYJ20190809163011543, JCYJ20200109140801751 and JCYJ20210324120010028), the Guangdong Provincial Key Laboratory of Catalysis (No. 2020B121201002), the Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06G587), and the Shenzhen Sci-Tech Fund (No. KYTDPT 20181011104007). We also thank the SUSTech Core Research Facilities for AFM and TEM measurements.
- DOI：10.1007/s10118-022-2719-z
  中图分类号：
- 收稿：2022-01-04，
  
  修回：2022-2-16，
  
  录用：2022-2-17，
  
  网络首发：2022-05-20，
  
  纸质出版：2022-08-01
- Accepted：
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Ke, C. X.; Lai, X.; Wang, H. T.; Pu, M. R.; Rehman, T.; Zhu, Y. L.; He, F. Subtle effect of alkyl substituted π-bridges on dibenzo[a,c]phenazine based polymer donors towards enhanced photovoltaic performance. Chinese J. Polym. Sci. 2022, 40, 889–897

Chun-Xian Ke, Xue Lai, Heng-Tao Wang, et al. Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance[J]. Chinese Journal of Polymer Science, 2022, 40(8): 889-897. DOI: 10.1007/s10118-022-2719-z.
Ke, C. X.; Lai, X.; Wang, H. T.; Pu, M. R.; Rehman, T.; Zhu, Y. L.; He, F. Subtle effect of alkyl substituted π-bridges on dibenzo[a,c]phenazine based polymer donors towards enhanced photovoltaic performance. Chinese J. Polym. Sci. 2022, 40, 889–897 DOI： 10.1007/s10118-022-2719-z.

Chun-Xian Ke, Xue Lai, Heng-Tao Wang, et al. Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance[J]. Chinese Journal of Polymer Science, 2022, 40(8): 889-897. DOI: 10.1007/s10118-022-2719-z. DOI：

摘要

Thiophene π-bridge alkyl substitution demonstrated an important strategy to enhance the photovoltaic performance of the polymer solar cells. Benefit from a good balance of solubility and molecular planarity

the n-hexyl substituted polymer donor PBP-C6 based devices

with Y5 as acceptor

exhibited the highest power conversion efficiency up to 11.60% among three donor polymers.

Abstract

Selection of the strategically substituted alkyl chains has a significant effect to modulate the physical properties of conjugated polymers

electro-optical characteristics

and active layer morphology of the corresponding polymer solar cells (PSCs). Herein

we systematically synthesized three dibenzo[

]phenazine based D-

-A donor polymers named PBP-C0

PBP-C8

and PBP-C6 with different alkyl substitutions on thiophene

-bridges

without alkyl

2-ethylhexyl and

-hexyl groups

respectively. The absence of the alkyl chain (PBP-C0) on the

-bridge caused poor solubility and unfavorable miscibility with the Y5 acceptor

leading to the lower photovoltaic performance. The bulky alkyl chain of 2-ethylhexyl on the

-bridge group caused the twisting of PBP-C8 conjugated backbone

which limits the charge transport and also compromises the photovoltaic performance. In contrast

the PBP-C6-with flexible linear alkyl chains has almost planar curvature geometry resulting in the small uniform domain size and appropriate phase separation in the blend film morphology. These favorable properties enhanced the exciton generation to dissociation

charge carrier mobility

and also lowered the charge recombination. Among three polymers

PBP-C6-based devices exhibit the best PCE of 11.60%. From these results

thiophene

-bridge alkyl substitution demonstrated an important strategy to adjust energy level

absorption

and phase separation morphology to enhance the photovoltaic performance of the PSCs.

关键词

Keywords

references

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Subtle Effect of Alkyl Substituted π-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance

DOI：10.1007/s10118-022-2719-z

摘要

Abstract

关键词

Keywords

references