Azaphenanthrene-based polycyclic acceptors regulated by N/halogen engineering (IMAGE)

Science China Press

Azaphenanthrene-based polycyclic acceptors regulated by N/halogen engineering

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Fluorine, chlorine, and bromine were introduced into the central core of azaphenanthrene-fused acceptors. Increasing halogen size progressively improved crystallinity and packing order; CHNBr delivered a 78.84% fill factor and enabled binary organic solar cells with power conversion efficiency above 20%.

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