Formation of Vitrified Solid Solution Enables Simultaneously Efficient and Stable Organic Solar Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

15 Scopus Citations
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Author(s)

  • Baobing Fan
  • Wei Gao
  • Ying Wang
  • Wenkai Zhong
  • Francis Lin
  • Fei Huang

Detail(s)

Original languageEnglish
Pages (from-to)3522-3529
Journal / PublicationACS Energy Letters
Volume6
Issue number10
Online published13 Sep 2021
Publication statusPublished - 8 Oct 2021

Abstract

Employing a ternary blend as absorber is an ingenious tactic to achieve broad spectral coverage in single-junction organic photovoltaics. The incorporation of a second acceptor with relatively lower electron affinity (EA) is important for attaining increased open-circuit voltage (VOC) of ternary devices. However, the common way in achieving a lower EA through tailoring the skeletons may affect the miscibility between acceptors, which inherently restrict the dependence of VOC on compositions. Herein, we developed a low-EA acceptor through side-chain engineering to ensure similarity with another ultranarrow-bandgap acceptor, enabling a good miscibility between the two species and formation of a vitrified solid solution over a large range of compositions. As a result, continuously increased VOC is realized, while the other parameters are less composition-sensitive. Besides, the vitrification facilitates intimate intermolecular interactions in ternary blends, suppressing thermally induced crystallization. Ultimately, increased photovoltaic efficiency and thermal stability are simultaneously achieved for the resulting ternary devices.

Citation Format(s)

Formation of Vitrified Solid Solution Enables Simultaneously Efficient and Stable Organic Solar Cells. / Fan, Baobing; Gao, Wei; Wang, Ying et al.

In: ACS Energy Letters, Vol. 6, No. 10, 08.10.2021, p. 3522-3529.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review