Patent ID: 6797583
Filing Date: 2004-09-28
Classification: H01L

Abstract:
A method of manufacturing a capacitor in semiconductor devices, the method comprising:forming a silicon oxide film on a surface of a silicon substrate; forming a nitride film on said silicon oxide film; forming a contact hole by sequentially etching a portion of said nitride film and said silicon oxide film; depositing a doped polysilicon layer over the entire surface of said silicon substrate, said doped polysilicon layer filling said contact hole; performing an etch-back process to remove a portion of said doped polysilicon layer, said etch-back process leaving said doped polysilicon layer in said contact hole; forming an ohmic contact layer over said doped polysilicon layer in said contact hole; forming an anti-diffusion film on said ohmic contact layer; forming a silicate glass film over the entire surface of said silicon substrate including said anti-diffusion film; forming a concave hole by etching a portion of said silicate glass film, said concave hole having an internal wall; forming a Ruthenium lower electrode on said internal wall of said concave hole; performing a NH3-plasma process and a N2O-plasma process sequentially on said Ruthenium lower electrode; forming a BST dielectric film on said Ruthenium lower electrode which had undergone said NH3-plasma process and said N2O-plasma process; crystallizing said BST dielectric film, said crystallizing including performing a rapid thermal process; forming an upper electrode on said BST dielectric film, said BST dielectric film, said lower Ruthenium electrode and said upper electrode forming said capacitor; and performing a thermal treatment to stabilize said capacitor.