Patent ID: 9111732
Filing Date: 2015-08-18
Classification: B41J,C23C,H01J,H01L

Abstract:
1. A sputtering method comprising the steps of: holding a target material to be sputtered on a sputter electrode placed within a vacuum vessel and also holding a substrate on a substrate holder placed within said vacuum vessel in a face-to-face relationship with said sputter electrode; and applying radio frequency waves to said sputter electrode from a radio frequency power source connected to said sputter electrode, whereby said target material is sputtered to form a thin film on a surface of said substrate from components of the target material, wherein a DC component of a potential difference between a substrate potential of said substrate and a ground potential is measured with a detector circuit provided in an impedance adjusting circuit one end of which is directly set at the ground potential, and wherein the result of detection with said detector circuit is displayed, the thus displayed result of detection is monitored, whereas a first impedance of said substrate holder is adjusted by adjusting a second impedance of an impedance circuit provided in said impedance adjusting circuit by control knobs from outside depending upon the displayed result of detection of the DC component with said detector circuit connected to said impedance circuit so as to adjust said substrate potential to 10V or higher for depositing the thin film on the surface of said substrate, wherein the thin film is a piezoelectric film, and wherein said piezoelectric film comprises one or more of perovskite oxides represented by the formula (P), a deposition temperature Ts (° C.) of said piezoelectric film is 400° C. or higher, and a differential potential Vs−Vf (V) that is a difference between a plasma potential Vs(V) during film deposition and a potential of said substrate Vf (V) satisfies following relations (1) and (2): where A is an element at site A which is at least one member of the group including Pb; B is an element at site B which is at least one member selected from the group consisting of Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Sc, Co, Cu, In, Sn, Ga, Zn, Cd, Fe, Ni, and lanthanides; O is an oxygen atom; a and b are each 1.0,