Patent ID: 8172372
Filing Date: 2012-05-08
Classification: B41J,C23C,H01J,H01L,Y10T

Abstract:
1. A film formation method of forming, on a substrate, a film containing constituent elements of a target through a vapor deposition process using plasma with placing the substrate and the target to face each other, the method comprising: carrying out the film formation with controlling a potential in a spatial range of at least 10 mm extending laterally from the outer circumference of the substrate to be equal to a potential on the substrate wherein the film comprises a piezoelectric film, and, wherein the film comprises, as a main component, one or two or more perovskite oxides represented by general formula (P): wherein A represents an A-site element and comprises at least one element selected from the group consisting of Pb, Ba, Sr, Bi, Li, Na, Ca, Cd, Mg, K, and lanthanide elements; B represents a B-site element and comprises at least one element selected from the group consisting of Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Mg, Sc, Co, Cu, In, Sn, Ga, Zn, Cd, Fe, Ni, Hf and Al; and 0 represents oxygen, and wherein a molar ratio of the A-site element, the B site element and the oxygen element is 1:1:3 as a standard; however, the molar ratio may be varied from the standard molar ratio within a range where a perovskite structure is obtained.