Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells

Zui-Yi Zhong; Jia-Xin Xu; Kai Zhang; Ming-Hao Dong; Qi-Ri Huang; Fei Huang

doi:10.1007/s10118-022-2825-y

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Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells

RESEARCH ARTICLE | Updated：2022-11-16

- Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells
- Chinese Journal of Polymer Science Vol. 40, Issue 12, Pages: 1586-1593(2022)
- Affiliations：
  
  Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  mszhangk@scut.edu.cn (K.Z.)
  msfhuang@scut.edu.cn (F.H.)
- Funds：
- DOI：10.1007/s10118-022-2825-y
  CLC：
- Received：24 March 2022，
  
  Revised：2022-6-7，
  
  Accepted：10 June 2022，
  
  Online First：26 September 2022，
  
  Published：01 December 2022
- Accepted：
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Zhong, Z. Y.; Xu, J. X.; Zhang, K.; Dong, M. H.; Huang, Q. R.; Huang, F. Unfused-ring acceptors with dithienobenzotriazole core for efficient organic solar cells. Chinese J. Polym. Sci. 2022, 40, 1586–1593

Zui-Yi Zhong, Jia-Xin Xu, Kai Zhang, et al. Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022, 40(12): 1586-1593.
Zhong, Z. Y.; Xu, J. X.; Zhang, K.; Dong, M. H.; Huang, Q. R.; Huang, F. Unfused-ring acceptors with dithienobenzotriazole core for efficient organic solar cells. Chinese J. Polym. Sci. 2022, 40, 1586–1593 DOI： 10.1007/s10118-022-2825-y.

Zui-Yi Zhong, Jia-Xin Xu, Kai Zhang, et al. Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022, 40(12): 1586-1593. DOI： 10.1007/s10118-022-2825-y.

摘要

Three unfused-ring acceptors

named DTBTzEH-IC2F

DTBTzMe-IC2F and DTBTzMe-IC2Cl

were designed and synthesized by changing length of alkyl chain on Dithienobenzotriazole (DTBTz) unit and halogen-substitution atoms of cyanoindenone terminal groups. The rigid aromatic ring DTBTz as an intermediate core effectively results in highly planar A-D-C-D-A small molecules. When blended with donor PBDB-T

the organic solar cell based on DTBTzMe-IC2Cl achieves the highest device efficiency of 12.3%.

Abstract

In recent years

non-fullerene acceptors (NFAs) with unfused-ring structure have received extensive attention due to their flexible combination of building blocks and relatively simple synthetic routes. In this work

three new A-D-C-D-A type unfused-ring acceptors (UFAs)

named DTBTzEH-IC2F

DTBTzMe-IC2F and DTBTzMe-IC2Cl

were designed and synthesized with dithienobenzotriazole (DTBTz) as the core. Through modification of alkyl chain on the DTBTz unit and change of halogen atoms on the cyanoindanone end groups

the differences in optoelectronic properties of these three small molecule acceptors were investigated. The results show that changes in alkyl chain and halogen atom endow UFAs with different features

including shift in absorption

changes in energy level and molecular packing. When blended with donor PBDB-T

the organic solar cell based on DTBTzMe-IC2Cl achieves the highest device efficiency of 12.3%

while DTBTzEH-IC2F-based device obtains 11.5% efficiency and DTBTzMe-IC2F-based device obtains 12.0% efficiency. The stability tests show that all the devices obtain good efficiency retention rates. These results demonstrate that the introduction of a rigid aromatic ring DTBTz as an intermediate core not only effectively results in highly planar A-D-C-D-A small molecules

but also provides a new reference for the design and development of UFAs in OSCs.

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references

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