Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells

Chao Li, Tian Xia, Jiali Song, Huiting Fu, Hwa Sook Ryu, Kangkang Weng, Linglong Ye, Han Young Woo, Yanming Sun

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Compared to thiophene-based non-fullerene acceptors (NFAs), selenophene-based NFAs have received much less attention. And organic solar cells (OSCs) based on selenophene-containing NFAs typically exhibit relatively low power conversion efficiency (PCE < 12%) and fill factor (FF < 70%). In this contribution, we have designed and synthesized two asymmetric selenophene-based NFAs, named SePTT-2F and SePTTT-2F, which possess the same end-capping group but different selenophene-containing conjugated backbones. On comparing the two NFAs, SePTTT-2F with more extended conjugation in the backbone was found to have almost the same maximum absorption peak and optical bandgap in film as SePTT-2F but an up-shifted lowest unoccupied molecular orbital (LUMO) energy level and higher electron mobility. By pairing the NFAs with the polymer donor PBT1-C, the resultant blend film based on SePTTT-2F exhibited higher and more balanced charge mobilities and more efficient exciton dissociation and charge collection in comparison with the SePTT-2F-based blend film. As a result, OSCs based on SePTTT-2F delivered an impressively high PCE of 12.24% with an outstanding FF of 75.9%, much higher than those of the SePTT-2F-based OSCs. To the best of our knowledge, the PCE of 12.24% and FF of 75.9% are among the highest values reported in the literature so far for both the parameters amongst selenophene-containing NFA-based OSCs. Our results demonstrate that extending the conjugation in the selenophene-containing backbone is an effective strategy to design highly efficient selenophene-based NFAs.

Original languageEnglish
Pages (from-to)1435-1441
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number4
DOIs
Publication statusPublished - 2019 Jan 1

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Thiophenes
Electron mobility
Optical band gaps
Molecular orbitals
Thiophene
Excitons
Electron energy levels
Conversion efficiency
Polymers
Organic solar cells
LDS 751

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells. / Li, Chao; Xia, Tian; Song, Jiali; Fu, Huiting; Ryu, Hwa Sook; Weng, Kangkang; Ye, Linglong; Woo, Han Young; Sun, Yanming.

In: Journal of Materials Chemistry A, Vol. 7, No. 4, 01.01.2019, p. 1435-1441.

Research output: Contribution to journalArticle

Li, Chao ; Xia, Tian ; Song, Jiali ; Fu, Huiting ; Ryu, Hwa Sook ; Weng, Kangkang ; Ye, Linglong ; Woo, Han Young ; Sun, Yanming. / Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells. In: Journal of Materials Chemistry A. 2019 ; Vol. 7, No. 4. pp. 1435-1441.
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