Characterization of aryl-functionalized 2,4,6-tris(2-thienyl)-1,3,5-triazine thin films and their application to organic field-effect transistors

Abstract

Aryl-functionalized 2,4,6-tris(2-thienyl)-1,3,5-triazine derivatives were applied as thin films via thermal vacuum deposition to investigate properties and potential of the thin films for use as active layers in organic field-effect transistors. All derivatives deposited on quartz substrates produced amorphous films. Ultraviolet–visible absorption spectra of the films resemble those of the molecules in solution, and fluorescence spectra depend largely on the aryl groups. When used in organic field-effect transistors, only the N,N-dibutylamino derivative could display the appropriate device characteristics under p-type operation, but it showed low mobility of charge carriers. The origin of the low mobility is discussed in terms of the electronic structure and film structure of the derivatives in the devices.