Light-induced EPR study of spin-assisted charge transport in PFOT:PC61BM composite
作者： Victor I. Krinichnyi , Evgenia I. Yudanova , Victor R. Bogatyrenko
DOI: 10.1016/J.JPHOTOCHEM.2018.12.032
关键词: Range (particle radiation) 、 Polaron 、 Electron paramagnetic resonance 、 Relaxation (NMR) 、 Chemistry 、 Photon energy 、 Paramagnetism 、 Charge carrier 、 Exchange interaction 、 Molecular physics
摘要: Abstract Magnetic resonance, relaxation and dynamic parameters of polaron spins methanfullerene radical anions, initiated by the infrared-visible-ultraviolet photons in bulk heterojunctions composite formed narrow-band poly[(9,9-dioctylfluorenyl-2.7-diyl)-co-(bithiophene)] (PFOT, F8T2) copolymer [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) globules were investigated direct Light-Induced Electron Paramagnetic Resonance (LEPR) spectroscopy. It was shown that some polarons are captured spin traps matrix due to its disordering. The number, spatial distribution energy depth such depend on structure morphology composite. is main both charge carriers determined exchange interaction ensembles, as well photons. formation between different packets cause extreme sensitivity composite's magnetic resonance electronic number initiating predominant photoinitiation localized demonstrated. This process substantially accelerated when illuminated with lying near 1.8 2.7 eV. recombination can be described terms a bimolecular second order. found contributions methanofullerene anions effective paramagnetic susceptibility increase photon 2.6 2.1 eV these carriers. mobility varies monotonically throughout all range, whereas librational dynamics 2.0
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