Force Field Parameters for Large-Scale Computational Modeling of Sensitized TiO2 Surfaces

نویسندگان

  • Sabas G. Abuabara
  • Jose A. Gascon
  • Cheryl Suet-Yee Leung
  • Luis G.C. Rego
  • Victor S. Batista
چکیده

Force field parameters for large scale computational modeling of sensitized TiO2-anatase surfaces are developed from ab initio molecular dynamics simulations and geometry optimization based on Density Functional Theory (DFT). The resulting force field, composed of Coulomb, van der Waals and harmonic interactions, reproduces the ab initio structures and the phonon spectra density profiles of TiO2-anatase nanostructures functionalized with catechol, a prototype of an aromatic linker commonly used to sensitize TiO2 nanoparticles with Ru(II)-polypyridyl dyes. In addition, simulations of interfacial electron injection and electron-hole relaxation dynamics demonstrate the capabilities of the resulting molecular mechanics forcefield, as applied in conjunction with mixed quantum-classical methods, for modeling quantum processes that are critical for the overall efficiency of sensitized-TiO2 solar cells.

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تاریخ انتشار 2006