Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 8, Pages 4072-4083Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10710f
Keywords
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Funding
- University of Science and Technology of China [KY2340000064]
- MEXT, Japan [JP15H05760, JP16H04187, JP17K19116]
- Bavarian Equal Opportunities Sponsorship - Forderung von Frauen in Forschung und Lehre (FFL)
- SFB 953 Synthetic Carbon Allotropes
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Magnesium tetraethynylporphyrins bearing four electron-deficient diketopyrrolopyrrole (DPP; Mg-TEP-DPP4) units were synthesized by Sonogashira coupling, and their optical and electrochemical properties were investigated. The energy levels were effectively tuned by DPP with or without electron-withdrawing end-caps. Importantly, all the Mg-TEP-DPP4 molecules have broad absorption bands across the visible and near-infrared regions. The time-dependent excited state features of Mg-TEP-DPP4 and their kinetics were investigated by femtosecond transient absorption spectroscopy in combination with multiwavelength and global/target analyses of time-resolved spectra. Importantly, the charge-separated state was demonstrated to undergo recombination within 253 ps in benzonitrile. Bulk heterojunction organic solar cells fabricated with Mg-TEP-DPP4:PC61BM exhibited a power conversion efficiency of 7.40% after solvent vapor annealing, which enabled balanced charge carrier transport, reduced charge recombination, and favorable charge separation and collection.
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