Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

25 Scopus Citations
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Author(s)

  • Baobing Fan
  • Wei Gao
  • Rui Zhang
  • Werner Kaminsky
  • Francis R. Lin
  • Xinxin Xia
  • Qunping Fan
  • Yanxun Li
  • Yidan An
  • Yue Wu
  • Ming Liu
  • Xinhui Lu
  • Feng Gao

Detail(s)

Original languageEnglish
Pages (from-to)5909-5919
Journal / PublicationJournal of the American Chemical Society
Volume145
Issue number10
Online published6 Mar 2023
Publication statusPublished - 15 Mar 2023

Link(s)

Abstract

Organic photovoltaics (OPVs) have achieved great progress in recent years due to delicately designed non-fullerene acceptors (NFAs). Compared with tailoring of the aromatic heterocycles on the NFA backbone, the incorporation of conjugated side-groups is a cost-effective way to improve the photoelectrical properties of NFAs. However, the modifications of side-groups also need to consider their effects on device stability since the molecular planarity changes induced by side-groups are related to the NFA aggregation and the evolution of the blend morphology under stresses. Herein, a new class of NFAs with local-isomerized conjugated side-groups are developed and the impact of local isomerization on their geometries and device performance/stability are systematically investigated. The device based on one of the isomers with balanced side- and terminal-group torsion angles can deliver an impressive power conversion efficiency (PCE) of 18.5%, with a low energy loss (0.528 V) and an excellent photo- and thermal stability. A similar approach can also be applied to another polymer donor to achieve an even higher PCE of 18.8%, which is among the highest efficiencies obtained for binary OPVs. This work demonstrates the effectiveness of applying local isomerization to fine-tune the side-group steric effect and non-covalent interactions between side-group and backbone, therefore improving both photovoltaic performance and stability of fused ring NFA-based OPVs. © 2023 American Chemical Society.

Research Area(s)

  • ACCEPTORS

Citation Format(s)

Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics. / Fan, Baobing; Gao, Wei; Zhang, Rui et al.
In: Journal of the American Chemical Society, Vol. 145, No. 10, 15.03.2023, p. 5909-5919.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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