Fluorination Effects on the Photophysics of Push-Pull Conjugated Polymer Aggregates: Converting the Quasi- to the Normal Interchain Polaron States
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내용
In this study, we elucidated the chain-length and fluorination-dependent exciton-dissociation mechanisms in push-pull conjugated polymer (CP, Mw 40k/100k PBDB-T and Mw 100k PM6) aggregates using transient absorption spectroscopy. The changed excitonic coupling patterns in the PM6 aggregates compared to those in the PBDB-T aggregates were confirmed by the spectroscopic results obtained with two pump wavelengths. We also observed two fluorination effects in the PM6 aggregates. Our findings provide new insights into the exciton dynamics study in CP aggregates and the bulk-heterojunction blends of polymer solar cells.