Charge transfer in poly(3-octylthiophene) modified by fullerene derivative

✍ Scribed by V.I. Krinichnyi; Y.N. Demianets; S.A. Mironova

• Book ID: 104085368
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 350 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2008.01.002

✦ Synopsis

Magnetic, relaxation, and electronic dynamic parameters of paramagnetic centers stabilized in an initial and fullerene-modified poly (3-octylthiophene) (P3OT) were studied at the 3-cm (9.7 GHz) waveband EPR in wide (77-320 K) temperature region. Both the systems demonstrate sum spectrum of localized and mobile polarons, whose contribution depends on polymer treatment. Both spin susceptibility and spin-spin relaxation rate were shown to govern by dipole-dipole interaction of the mobile polarons. The spin-lattice and spin-spin relaxation times were determined separately by using the steady-state saturation method. It was shown that the treatment of the P3OT sample with fullerene molecules leads to the decrease in activation energy of spin susceptibility, dipole-dipole interaction, and interchain diffusion. This is accompanied by the acceleration of spin relaxation and increase in the system dimensionality.