Fig. 4. (a) CV characteristics in RR-P3HT/PCBM composites MIS diode with Al top electrode. Squares and circles show the data before and after annealing, respectively. (b) VG dependence of Nspin. Circles show Nspin for the PCBM radical anions at 10 K. Squares show that for the polarons of RR-P3HT at 290 K.