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A polycondensation solid-state-reaction-based polyimide (PI) matrix has been used for composite material formation. Two types of PI matrix have been employed – a bulk PI system prepared by pressing a mixture of the powdered precursors (4, 4′-oxidianiline (ODA) and pyromellitic dianhydride (PMDA)) and a thin-film matrix formed by vapor co-deposition of the same precursors, PI monomers. A variety of...
Space-charge-limited conductivity in thin vacuum-evaporated α-form copper phthalocyanine (CuPc) films with columnar molecular structure perpendicular to the substrate plane was investigated. The shape of current-voltage characteristics and the density-of-states function (DOS) were strongly influenced by adsorbed oxygen. Oxygen formed hole traps distributed in energy about 0.38eV deep.
Polyimide (PI) - phthalocyanine (Pc) composite films prepared by means of simultaneous vacuum deposition of vapours of PI precursors - oxydianiline (ODA) and pyromellitic dianhydride (PMDA), and Pc - metal-free - or copper phthalocyanine, were investigated. Thermal treatment regimes for imidization of ODA and PMDA to PI without essential changes in the chromophore concentration and in the surface...
The development of modern microelectronics produces a need to develop materials with a relative dielectric constant ε r , lower than that of silicon dioxide for intermetal applications. Lower permittivities mean lower capacitances and therefore shorter RC delay, faster device speeds, less crosstalk and less power dissipation. A promising @'tailor made@' candidate is the evaporated polymer-polyimide...
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