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approximately 2.3 eVand relatively low HOMO energy levels
around −5.9 eV. This is energetically suitable position indicat-
ing hole transfer from the dyes to polymer donor in BHJ-SC
devices. Pyridinium substituent of Rbf-III narrows the band
gap of riboflavin to 2.34 eVand improves the electron accep-
tor property of the structure.
One of the major findings of this work is that photophysical
and charge transport properties of riboflavin core can be mod-
ified significantly attaching with different substituents. This
study reveals that optical and charge-transport properties of
neutral riboflavin structure with long alkyl chain encourage
the synthesis of new riboflavin derivatives for organic photo-
voltaic applications. Similar modifications on riboflavin struc-
ture can give some insights into its potential usage in more
favorable optoelectronic materials.
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number of 113Z250. We thank to Ege University for the support of the
use of Gaussian 09 W programme for DFT calculations.
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