Abstract
Optical generation of charge carriers and their transport in blends of the spirobifluorene-co-benzothiadiazole copolymer (PSF-BT) and the electron acceptor phenyl-C61-butyric acid methyl ester (PCBM) have been investigated by means of time-resolved fluorescence, transient absorption, as well as by integral mode time-of-flight method, and its ultrafast all-optical analogue based on electric field-induced second harmonic generation. PCBM in this blend was found to act as an energy and electron acceptor, however its role in charge carrier photogeneration is ambiguous: it slows down separation of charge pair states, but slightly increases the carrier generation yield. We attribute these properties to formation of highly stabile and strongly bound charge pair states with a hole localized on spiroconjugated fluorene side group of polymer and electron trapped on PCBM.
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