Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 55, Issue 16, Pages 2691-2699Publisher
WILEY
DOI: 10.1002/pola.28676
Keywords
azaisoindigo; conjugated polymers; energy loss; functionalization of polymers; high performance polymers; thin-film transistor; solar cells
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Funding
- Marie Curie Intra-European Fellowship with the 7th European Community Framework Programme [FP7-PEOPLE-2013-IEF-622187]
- EC FP7 Project SC2
- EC FP7 Project ArtESun
- EC FP7 Project PolyMed
- EPSRC [EP/M00514311, EP/G037515/1]
- EPSRC [EP/J021199/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J021199/1] Funding Source: researchfish
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Two donor-acceptor conjugated polymers with azaisoindigo as acceptor units and bithiophene and terthiophene as donor units have been synthesized by Stille polymerization. These two polymers have been successfully applied in fieldeffect transistors and polymer solar cells. By changing the donor component of the conjugated polymer backbone from bithiophene to terthiophene, the density of thiophene in the backbone is increased, manifesting as a decrease in both ionization potential and in electron affinity. Therefore, the charge transport in field-effect transistors switches from ambipolar to predominantly hole transport behavior. PAIIDTT exhibits hole mobility up to 0.40 cm(2)/Vs and electron mobility of 0.02 cm(2)/ Vs, whereas PAIIDTTT exhibits hole mobility of 0.62 cm(2)/Vs. Polymer solar cells were fabricated based on these two polymers as donors with PC61BM and PC71BM as acceptor where PAIIDTT shows a modest efficiency of 2.57% with a very low energy loss of 0.55 eV, while PAIIDTTT shows a higher efficiency of 6.16% with a higher energy loss of 0.74 eV. Our results suggest that azaisoindgo is a useful building block for the development of efficient polymer solar cells with further improvement possibility by tuning the alternative units on the polymer backbone. (C) 2017 Wiley Periodicals, Inc.
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