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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
- 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.
- Subjects :
- chemistry.chemical_classification
010407 polymers
Materials science
Organic solar cell
Band gap
Stacking
02 engineering and technology
Electron acceptor
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Acceptor
Polymer solar cell
0104 chemical sciences
chemistry.chemical_compound
chemistry
Thioether
Thiophene
General Materials Science
0210 nano-technology
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 11
- Issue :
- 35
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....da0a1da3d6f2dbbe8d12fca36fcb7824