Simple Formation of C₆₀ and C₆₀-Ferrocene Conjugated Monolayers Anchored onto Silicon Oxide with Five Carboxylic Acids and Their Transistor Applications

Abstract

C60 and C60-ferrocene conjugated molecule bearing five carboxylic acids successfully anchor onto a silicon oxide surface as a monolayer through a simple method of simply dipping an amino-terminated surface into the solution of the C60 derivatives. The monolayer structure was characterized by UV−vis spectroscopy, X-ray reflectivity, X-ray photoelectron spectroscopy, and IR spectroscopy to reveal that the molecules are standing presenting its C60 spherical face at the surface. The electronic effect of the C60 monolayer and the ferrocene-functionalized C60 monolayer in OFET devices was investigated. When an n-type OFET was fabricated on the ferrocene functionalized monolayer, we see an enhancement in the mobility. When a p-type OFET was made the ferrocene-functionalized C60 monolayer showed a lowering of the carrier mobility.