HIGH-K PEROVSKITE MATERIAL AND METHODS OF MAKING AND USING THE SAME

摘要

High-k materials and devices, e.g., DRAM capacitors, and methods of making and using the same. Various methods of forming perovskite films are described, including methods in which perovskite material is deposited on the substrate by a pulsed vapor deposition process involving contacting of the substrate with perovskite material-forming metal precursors. In one such method, the process is carried out with doping or alloying of the perovskite material with a higher mobility and/or higher volatility metal species than the metal species in the perovskite material- forming metal precursors. In another method, the perovskite material is exposed to elevated temperature for sufficient time to crystallize or to enhance crystallization of the perovskite material, followed by growth of the perovskite material under pulsed vapor deposition conditions. Various perovskite compositions are described, including: (Sr, Pb)TiO3; SrRuO3 or SrTiO3, doped with Zn, Cd or Hg; Sr(Sn,Ru)O3; and Sr(Sn,Ti)O3.