Communication
ChemComm
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Fig. 1 (a) Illustration of the n-type perovskite solar cell structure used in this
work. (b) J–V curves (reverse scan) of 4a (red line) and reference (blue line).
´
7 For selected reviews, see: (a) N. Rodrıguez and L. J. Goossen,
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18.49% with a short-circuit current density (JSC) of 23.28 mA cmꢁ2
,
˜
E. F. Lopes, D. Alves, G. Perin, R. G. Jacob and E. J. Lenardao,
Chem. Rev., 2019, 119, 7113–7278.
an open-circuit voltage (VOC) of 1.09 V, and a fill factor (FF) of 0.73
were achieved for the SnO2/4a-based PSC, while the control device
with a pristine SnO2 ETL showed a lower PCE of 17.44% with a
short-circuit current density (JSC) of 21.56 mA cmꢁ2, an open-
circuit voltage (VOC) of 1.07 V, and a fill factor (FF) of 0.75. This
result revealed that fullerene derivative 4a was a promising
modification material on the ETL for the n–i–p-type PSCs.
In summary, we disclose a novel copper-promoted decarbox-
ylative annulation of C60 with two identical a-oxocarboxylic acids
to afford the unique epoxy-bridged C60-fused lactones via an
unprecedented cascade addition pathway. The current protocol
provides facile access to epoxy-bridged C60-fused lactones, which
can be further functionalized to the rare epoxy-bridged C60-fused
hemiacetal and bicyclic-fused 1,2,3,4-adducts. The structure of
C60-fused lactones and the derived bicyclic-fused 1,2,3,4-adducts
are unequivocally established by single-crystal X-ray crystallogra-
phy. Plausible reaction mechanisms leading to the formation of
C60-fused lactones and bicyclic-fused 1,2,3,4-adducts are pro-
posed. The application of a representative fullerene product in a
perovskite solar cell device has also been investigated.
´
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We are grateful for financial support from the National
Natural Science Foundation of China (22071231).
Conflicts of interest
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12234–12236.
There are no conflicts to declare.
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