Over 17% Efficiency Binary Organic Solar Cells with Photoresponses Reaching 1000 nm Enabled by Selenophene-Fused Nonfullerene Acceptors

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

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Author(s)

  • Francis Lin
  • Ziang Wu
  • Hongna Zhang
  • Wei Gao
  • Yuxiang Li
  • Zongwei Cai
  • Han Young Woo

Detail(s)

Original languageEnglish
Pages (from-to)9-15
Journal / PublicationACS Energy Letters
Volume6
Issue number1
Online published20 Nov 2020
Publication statusPublished - 8 Jan 2021

Abstract

Nonfullerene acceptors (NFAs) have played an important role in the development of organic solar cells. However, the optical absorption of most NFAs is limited within 600-900 nm, prohibiting further improvement of short-circuit current density (Jsc). To alleviate this problem, a fused-ring π-core BzS was designed by combining weakly electron-withdrawing benzotriazole (Bz) and strongly electron-donating selenophene together. Besides, the length of N-alkyl chain on the Bz moiety was engineered to tune the morphology, affording two NFAs mBzS-4F and EHBzS-4F. Both NFAs possess an absorption edge approaching 1000 nm, as resulted from the enhanced intramolecular charge transfer in conjunction with efficient intra- and intermolecular interactions. Binary photovoltaic devices based on PM6:mBzS-4F showed a power conversion efficiency of 17.02% with a very high Jsc of 27.72 mA/cm2 and a low energy loss of 0.446 eV. This work provides a strategy for future design of efficient NIR-responsive materials.

Citation Format(s)

Over 17% Efficiency Binary Organic Solar Cells with Photoresponses Reaching 1000 nm Enabled by Selenophene-Fused Nonfullerene Acceptors. / Qi, Feng; Jiang, Kui; Lin, Francis et al.

In: ACS Energy Letters, Vol. 6, No. 1, 08.01.2021, p. 9-15.

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