Initial stages of growth of heteroepitaxial yttria-stabilized zirconia films on silicon substrates

A low temperature process has been developed to grow high quality heteroepitaxial yttria-stabilized zirconia films on Si substrates at 200-800 degreesC. The technique involves reactive sputtering in an electron cyclotron resonance plasma stream reactor. Successful growth of this heteroepitaxial Rim on Si is important for applications such as high temperature superconductors on Si, silicon-on-insulator, and high permittivity dielectrics for dynamic random access memory applications. The material prepared in this investigation was determined to he of high crystalline quality by X-ray diffraction, Rutherford backscattering spectrometry, and transmission electron microscopy. The presence of an oxygen passivating layer on the Si substrate surface was determined to he important fur the heteroepitaxial growth of this material. Once heteroepitaxial growth is established, it can be successfully continued at substrate temperatures as low as 200 degreesC. Material quality was also observe to improve with increasing film thickness due to a self-healing process. Furthermore, material quality could he significantly improved by a postdeposition high temperature anneal step. (C) 2000 The Electrochemical Society. S0013-4651(00)08-081-2. All rights reserved.