A study on fullerene incorporated into a porous silicon matrix (photoluminescence)

Abstract

Samples with low-energy C60 ions implanted into porous silicon were fabricated with the ionized cluster beam deposition approach for improving the light emission of C60. Depth analysis by secondary-ion mass spectroscopy showed that C60 had been incorporated into porous silicon. The photoluminescence spectrum measured under excitation by an Ar+ laser (514.4 nm) at room temperature showed a large number of intense and well resolved fine-structure peaks. These features indicated the strong coupling of vibrational progressions with the electron states of C60, induced by the interaction between the C60 molecule and the nanometre-sized silicon particles.

Organic-Inorganic Nanosystem Based on Fullerene Embedded in Porous Silicon Matrix

“…The existence of a covalent interaction between porous silicon and fullerene molecules can affect the luminescent properties of porous silicon [6,7]. In most investigations, such an effect is manifested only in the passivation action of a fullerene coating which become significant after the annealing of a hybrid layer in the hydrogen atmosphere [5,6].…”

“…On the other hand, it was shown that the deposition of nanostructural carbon layers on the surface of porous silicon substantially (by several orders of magnitude) increases the specific surface area and significantly decreases the surface resistance of a porous material [4]. The subjects of a rising interest are the carbon clusters such as fullerenes, especially C 60 , embedded in a porous silicon matrix [5][6][7].…”

“…The emission from porous silicon can be considered as a process of monomolecular recombination limited by the tunneling across a potential barrier or as the bimolecular process of recombination of an electron and a hole, being free or bound to an exciton [10]. The analysis of the photoluminescence (PL) excitation spectra indicates that the excitation process in embedded C 60 molecules is completely similar to that in porous silicon [5][6][7]. The enhanced PL mainly arises from the radiative recombination of carriers which are formed in PS and then are transferred to C 60 molecules.…”