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F-Substituted oligothiophenes serve as nonfullerene acceptors in polymer solar cells with open-circuit voltages > 1 V
Duan, Tainan1,2; Babics, Maxime2; Seitkhan, Akmaral2; Firdaus, Yuliar2; Liang, Ru-Ze2; Cruciani, Federico2; Liu, Shengjian2; Lopatin, Sergei3; Beaujuge, Pierre M.2
2018-05-28
摘要We report on a set of two analogous, F-substituted oligothiophene derivatives (D5T6F-M and D7T8F-M), in which systematic fluorination at the thienyl moieties is shown to induce a sufficient increase in electron affinity (EA; i.e. suppressed LUMO level) and in ionization potential (IP; i.e. deeper HOMO) to (i) impart the molecules with electron-accepting and -transporting characteristics, and (ii) yield high open-circuit voltages >1 V in BHJ solar cells when combined with a low-bandgap polymer donor (PCE10) commonly used with fullerenes. The nonfullerene BHJ devices with the SM acceptor D5T6F-M achieve power conversion efficiencies (PCEs) of up to ca. 4.5% (vs. ca. 2% for D7T8F-M-based devices). Our study shows that -F substitutions in SM systems - otherwise used as donors - is an effective approach in the design of nonfullerene acceptors for efficient BHJ solar cells with polymer donors.
DOI10.1039/c8ta02781a
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
卷号6期号:20页码:9368-9372
收录类别EI
WOS记录号WOS:000433427300003
语种英语