Figure 2From: Tuning the electronic band structure of PCBM by electron irradiation FTIR spectra. (A) FTIR spectrum of electron-irradiated PCBM at electron fluence of (a) 0, (b) 3.6 × 1016 cm-2, (c) 7.2 × 1016 cm-2, and (d) 1.44 × 1017 cm-2 including assignment of several vibration modes with its peak position. (B) Relative intensity of vibration modes in the butyric acid methyl ester side chain and phenyl ring of electron-irradiated PCBM.Back to article page