Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 15, Pages 7083-7089Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00599a
Keywords
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Funding
- National Natural Research Foundation of China [21702158]
- Shen Zhen Technology and Innovation Commission [CYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council (Research Impact Fund) [R6021-18, 16305915, 16322416, 606012, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
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Over the past decade, fluorinated materials have become the dominant donors for achieving high power conversion efficiencies in organic solar cells (OSCs). Research on F substituents on N-heterocycle-based polymer solar cells was firstly carried out by introduction of the F atom into the pyrazine-based acceptor unit, which was successfully applied in constructing a polymer (BDT-FPY) for PSCs. MeIC-based polymer solar cells (PSCs) with BDT-FPY as a donor achieve a high power conversion efficiency (PCE) of up to 12.30%, significantly higher than that of a device based on BDT-PY:MeIC (the PCE of unfluorinated polymer donor BDT-PY is 10.2%). The higher PCE of BDT-FPY:MeIC is attributed to more balanced mu(h)/mu(e), better molecular packing, and more appropriate phase separation features. This result shows great potential for creating high-performance N-heterocycle-based PSCs.
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