Effect of spin localization on charge transport in low-bandgap bilayered ordered nanocomposites

摘要: Abstract Direct Light-Induced Electron Paramagnetic Resonance was used for comparative study of magnetic, relaxation and dynamic parameters spin charge carriers, polarons methanofullerene anion radicals, photoinduced in bulk heterojunctions composites formed by low-bandgap copolymers, poly[2,7-(9,9-dioctylfluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO-DBT) poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM). A fraction is captured deep traps reversibly initiated the copolymer backbone due to its disordering. The number energy depth are governed structure matrix photon energy. Both exhibit photo-response within energy/wavelength 1.32–3.14 eV/940–395 nm regions which wider than those other polymer composites. dynamics carriers were shown be exchange interaction their spins specific morphology provokes extreme selectivity these anisotropy polaron mobility through reflect system dimensionality dependent on Compared PFO-DBT, PCDTBT composite more organised, resulting a decrease change order recombination process. decay free interpreted terms trapping-detrapping diffusion heterojunctions.