Light-induced ESR studies in conjugated polymer-fullerene composites

摘要: Abstract In this contribution we discuss photo-induced electron transfer in conjugated polymer/fullerene composites and compare with light induced effects pure components. Two overlapping LESR lines are observed, from positive polarons on the polymer chains negative charges fullerene moieties. Microwave power saturation studies show different relaxation times for these two spins, giving clear evidence independent spins. The unusually high rate of monoanionic spins is intrinsic origin discussed terms a splitting T 1u level by Jahn-Teller type distortion as proposed literature. We observed distinct contributions to signals, prompt persistent one. Excitation intensity dependence into P + C 60 − ESR signals bimolecular (I 0.5 ) implies mutual annihilation within (P …C pair. found be excitation originate deep traps due disorder.