RuO2/Ru conducting films were deposited on low stress Si 3N4/Si substrates by reactive r.f. sputtering deposition at a substrate temperature of 400 °C to introduce a new bottom electrode for microelectromechanical system devices based on a Pb(Zr1-xTix)O3 film and a surface micromachining technique with high temperature processes. X-ray diffraction and scanning electron microscopy measurements after heat treatment at 700 °C were conducted to investigate structural stability of the RuO2/Ru films, which showed no silicide and silicon oxide formations by the heat treatment. Interfacial structures of the film with the heat treatment were similar to those of the as-deposited films. The surface of the film with the heat treatment consisted of larger grains than those of the as-deposited film. Rutherford backscattering spectrometry and Auger electron spectroscopy showed no interfacial reactions between the RuO2/Ru and the Si3N4. In order to investigate the feasibility of the RuO2/Ru as a bottom electrode, Pb(Zr0.53Ti 0.47)O3 films were deposited by metalorganic decomposition. After deposition of a Pb(Zr0.53Ti 0.47)O3 film at 700 °C for 30 min, the interface structure between the RuO2/Ru and the Pb(Zr 0.53Ti0.47)O3 film showed no interface reactions. The electrical properties of the PZT film on the RuO2/Ru were not changed before and after an HF etching to make an air gap, even though the piezoelectric coefficients on the RuO 2/Ru were lower than on the Pt/Ti. Therefore, the RuO 2/Ru conducting film could be used for a bottom electrode on the Si3N4/Si for a microelectromechanical system device based on a Pb(Zr1-xTi x)O3 film and a surface micromachining technique with high temperature processes.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of Materials Science: Materials in Electronics|
|State||Published - Dec 1998|