Abstract
We present a study of the photophysical and photovoltaic properties of blends of violanthrone in poly[9,$9\text{\ensuremath{-}}\mathrm{bis}$(2-ethylhexyl)-fluorene-2,$7\text{\ensuremath{-}}\mathrm{diyl}$] $({\mathrm{PF}}_{2∕6})$. Photoluminescence quenching and photocurrent measurements show moderate efficiencies for charge generation, characteristic of such polymer/dye blends. Pump-probe measurements on blend films suggest that while $\ensuremath{\sim}47%$ of the total exciton population dissociates within $4\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$ of photoexcitation, only $\ensuremath{\sim}32%$ subsequently results in the formation of dye anions. We attribute the discrepancy to the likely formation of complex species with long lifetimes, such as stabilized interface charge pairs or exciplexes. This conclusion is supported by the appearance of a long lifetime component of $2.4\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ in the dynamics of the photoinduced absorption signal associated to polarons in photoinduced absorption bands centered at $560\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
