Characteristic of Organic Thin Film Depending on Carbon Content by Fourier Transform Infrared Spectra and X-ray Diffraction Pattern

摘要

Recently, organic semiconductors have attracted considerable attention to flexible electric application using low-dielectric (low-k) materials or organic thin film transistor. Conjugate polymers derive their semiconduction properties by having delocalized pi-electron bonding along the polymer chain. The pi and pi~* orbitals form delocalized valence and conduction wave functions, which support mobile charge carriers. One of the next candidates as low-k materials is SiOC film, which posses a lower dielectric constant due to the presence of lighter C and H atoms, as opposed to Si and O atoms. Pentacene material as an organic conductor has been widely used in organic thin film transistors (OTFTs). However, in comparison with inorganic semiconductors, the electric properties of organic semiconductors are relatively little known. Especially, pentacene growth depends absolutely on the surface's properties on gate insulator due to the organic reaction. Therefore, it is important to understand the underlying organic molecular reaction between inter-layers. The mobility of pentacene increases dramatically on me hybrid type insulators, which is required an ionic bonding during the reaction. Because it's macro-structure becomes stable and the high degree of the amorphous structure. Finally the dielectric constant increases at the hybrid type sample and the leakage current also decreases.