Relaxation of the Excited States and Analysis of the Photocurrent Spectrum of C₆₀ Polycrystalline Films

S. Kazaoui, R. Ross, and N. Minami
[Synth. Met., Vol.70, pp.1403-1404, 1995]

Excitation relaxation processes in C₆₀thin film are investigated by means of steady state photoconductivity and photoluminescence. The photocarrier generation efficiency phi(lambda) has been calculated in terms of the bimolecular recombination limited model for the bulk-generated charge carriers. The photocarrier generation efficiency is almost wavelength independent in the rang 300 leq lambda leq 600nm whereas it is strongly wavelength dependent for lambda geq 600nm. The electric field induced fluorescence quenching has been observed and its efficiency is dependent on the excitation wavelength. A tentative interpretation of the excitation relaxation process is proposed invoking charge transfer states.