Fullerene C60-silver nanoparticles hybrid structures: Optical and photoelectric characterization

N. L. Dmitruk, O. Yu Borkovskaya, S. V. Mamykin, D. O. Naumenko, N. I. Berezovska, I. M. Dmitruk, V. Meza-Laguna, E. Alvarez-Zauco, E. V. Basiuk

Research output: Contribution to journalArticlepeer-review

Abstract

A detailed optical and photoelectric characterization of pristine fullerene C60 films deposited onto n-silicon substrates (C60/Si), C60 films crosslinked by means of the solvent-free chemical functionalization with 1,8-diaminooctane (C60-DA/Si), and the pristine and crosslinked films decorated with silver nanoparticles (C 60-Ag/Si and C60-DA-Ag/Si), was carried out. The reflectance spectra obtained allowed to calculate the absorption coefficient (α = 47π/λ) spectral dependencies and the spectra of light transmittance in layered barrier structures metal(Au)/fullerene/Si. Photoelectric properties of the films were investigated as well. The experimentally measured values of band gap were in a good agreement with mobility gap values (2.3 ± 0.1 eV). The decoration of fullerene films (both pristine and chemically crosslinked) with silver nanoparticles did not change the photocurrent spectra as compared to those for undecorated fullerene films, but lowered the values of internal quantum efficiency Oint. The photocurrent generated in fullerene/Si heterostructure, showed a maximum value at λ ∼450 nm (Qint max ≈ 0.25 for decorated and undecorated C60-DA/Si films), and it was higher for the samples based on pristine C60 films, in accordance with their higher absorption coefficient. Diminishing of Oint for C60-DA/Si and C 60-DA-Ag/Si films was observed for the spectral range of photocurrent generated in Si layer. The analysis of dark current-voltage characteristics showed that the barrier properties differ insignificantly, though a certain increase of series resistance was observed for the C60-DA/Si samples.

Original languageEnglish
Pages (from-to)5958-5965
Number of pages8
JournalJournal of nanoscience and nanotechnology
Volume8
Issue number11
Publication statusPublished - Nov 2008
Externally publishedYes

Keywords

  • 1,8-diaminooctane
  • Characterization
  • Optical
  • Photoelectric
  • Silver nanoparticles
  • Thin films

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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