Patent ID: 8026143
Filing Date: 2011-09-27
Classification: H01L

Abstract:
1. A method of manufacturing a MOS field effect transistor with a high permittivity gate dielectrics layer, comprising: forming first high permittivity gate dielectrics on a silicon dioxide (SiO forming second high permittivity gate dielectrics having a relative permittivity constant being different from that of the first high permittivity gate dielectrics; and forming a metal electrode film on the second high permittivity gate dielectrics, wherein the first and second high permittivity gate dielectrics constitute the high permittivity gate dielectrics layer, wherein the formation of the first high permittivity gate dielectrics comprises: a first step for depositing a first metal film containing Hf on the silicon dioxide (SiO a second step for forming the first high permittivity gate dielectrics of HfSiO by subjecting the first metal film and the silicon dioxide (SiO wherein the formation of the second high permittivity gate dielectrics comprises: a third step for depositing a second metal film of Ti on the first high permittivity gate dielectrics of HfSiO, by means of a sputtering method using a metal target of Ti in an atmosphere where oxidation reaction of metal atoms hardly occurs; and a fourth step for forming the second high permittivity gate dielectrics of TiO wherein a EOT (Equivalent Oxide Thickness) of the high permittivity gate dielectrics layer is 1.0 nm or less and a leakage current thereof is 10 the first to fourth steps are sequentially performed without exposing the first and second metal films and the resultant first and second high permittivity gate dielectrics to atmospheric air.