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Schematic illustration of the modification in the molecular structure of PCBM by electron irradiation. (A) Molecular structure of pristine PCBM. (B) Formation of methoxy radical and phenyl radical by electron irradiation. (C) Formation of new methoxy-substituted phenyl ring by the combination of the methoxy radical and the phenyl radical. (D) Destruction of the C60 cage by high-dose electron irradiation.
