Journal
MACROMOLECULES
Volume 51, Issue 1, Pages 71-79Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b00934
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Funding
- KAUST
- EC [610115, 643791]
- EPSRC [EP/G037515/1, EP/M005143/1]
- Cambridge Overseas Trust
- Chinese Scholarship Council
- Engineering and Physical Sciences Research Council [EP/J021199/1, EP/M005143/1, 1648728] Funding Source: researchfish
- EPSRC [EP/J021199/1, EP/R031894/1] Funding Source: UKRI
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A novel fused heterocycle-flanked diketopyrrolopyrrole (DPP) monomer, thieno[2,3-b]pyridine diketopyrrolopyrrole (TPDPP), was designed and synthesized. When copolymerized with 3,4-difluorothiophene using Stille coupling polymerization, the new polymer pTPDPP-TF possesses a highly planar conjugated polymer backbone due to the fused thieno[2,3-b]pyridine flanking unit that effectively alleviates the steric hindrance with both the central DPP core and the 3,4-difluorothiophene repeat unit. This new polymer exhibits a high electron affinity (EA) of -4.1 eV and was successfully utilized as an n-type polymer semiconductor for applications in organic field-effect transistors (OFETs) and all polymer solar cells. A promising n-type charge carrier mobility of 0.1 cm(2) V-1 s(-1) was obtained in bottom-contact, top-gate OFETs, and a power conversion efficiency (PCE) of 2.72% with a high open circuit voltage (V-OC) of 1.04 V was achieved for all polymer solar cells using PTB7-Th as the polymer donor.
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