Derivatization and diffusive motion of molecular fullerenes: Ab initio and atomistic simulations

Golibjon Berdiyorov, K. Harrabi, U. Mehmood, F. M. Peeters, Nouar Tabet, J. Zhang, I. A. Hussein, M. A. McLachlan

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Abstract

Using first principles density functional theory in combination with the nonequilibrium Green's function formalism, we study the effect of derivatization on the electronic and transport properties of C<inf>60</inf> fullerene. As a typical example, we consider [6,6]-phenyl-C<inf>61</inf>-butyric acid methyl ester (PCBM), which forms one of the most efficient organic photovoltaic materials in combination with electron donating polymers. Extra peaks are observed in the density of states (DOS) due to the formation of new electronic states localized at/near the attached molecule. Despite such peculiar behavior in the DOS of an isolated molecule, derivatization does not have a pronounced effect on the electronic transport properties of the fullerene molecular junctions. Both C<inf>60</inf> and PCBM show the same response to finite voltage biasing with new features in the transmission spectrum due to voltage induced delocalization of some electronic states. We also study the diffusive motion of molecular fullerenes in ethanol solvent and inside poly(3-hexylthiophene) lamella using reactive molecular dynamics simulations. We found that the mobility of the fullerene reduces considerably due to derivatization; the diffusion coefficient of C<inf>60</inf> is an order of magnitude larger than the one for PCBM.

Original languageEnglish
Article number025101
JournalJournal of Applied Physics
Volume118
Issue number2
DOIs
Publication statusPublished - 14 Jul 2015

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Berdiyorov, G., Harrabi, K., Mehmood, U., Peeters, F. M., Tabet, N., Zhang, J., Hussein, I. A., & McLachlan, M. A. (2015). Derivatization and diffusive motion of molecular fullerenes: Ab initio and atomistic simulations. Journal of Applied Physics, 118(2), [025101]. https://doi.org/10.1063/1.4923352