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Thioether Bond Modification Enables Boosted Photovoltaic Performance of Nonfullerene Polymer Solar Cells

Thioether Bond Modification Enables Boosted Photovoltaic Performance of Nonfullerene Polymer Solar Cells

Authors :
Tao Liu
He Yan
Yiwang Chen
Tao Yang
Yiqun Xiao
Ying Wang
Youdi Zhang
Zhongyi Yuan
Yongfang Li
Xinhui Lu
Source :
ACS applied materialsinterfaces. 11(35)
Publication Year :
2019

Abstract

A small-molecule nonfullerene acceptor, ITIC-S, bearing a fused heptacyclic benzodi(cyclopentadithiophene) core with a thioether-bond-substituted thiophene, is designed, synthesized, and compared with its alkyl-substituted analog, ITIC2. Compared with ITIC2, ITIC-S with a thioether bond exhibits higher electron mobility, a slightly larger optical band gap, and similar absorption. The active layer incorporating ITIC-S and the wide-bandgap polymeric donor PBDB-T-SF displays a smaller crystalline coherent length of π-π stacking, more balanced mobilities, weaker bimolecular recombination, and more effective charge collection than its PBDB-T-SF:ITIC2 counterpart. Accordingly, polymer solar cells incorporating ITIC-S and PBDB-T-SF demonstrate a fill factor (FF) of 66.8% and a champion power conversion efficiency (PCE) of 11.6%, exceeding those of the PBDB-T-SF:ITIC2 blend (PCE = 10.1%, FF = 59.7%), which shows that the thioether bond substitution strategy is an easy yet viable way for designing high-performance electron acceptors.

Details

ISSN :
19448252
Volume :
11
Issue :
35
Database :
OpenAIRE
Journal :
ACS applied materialsinterfaces
Accession number :
edsair.doi.dedup.....da0a1da3d6f2dbbe8d12fca36fcb7824