Patent ID: 7745869

Claim:
A thin film capacitance element, comprising a lower portion electrode, a dielectric thin film including a bismuth layer compound having a c-axis oriented vertically with respect to a substrate surface, and an upper portion electrode are successively formed on the substrate, wherein: the bismuth layer compound is composed of a thin film capacitance element composition; the bismuth layer compound is expressed by a composition formula of (Bi 2 O 2 ) 2+ (A m−1 B m O 3m+1 ) 2− or Bi 2 A m−1 B m O 3m+3 , wherein: “m” is an even number, “A” is at least one element selected from Na, K, Pb, Ba, Sr, Ca and Bi, and “B” is at least one element selected from Fe, Co, Cr, Ga, Ti, Nb, Ta, Sb, V, Mo and W; Bi in said bismuth layer compound is excessively included with respect to said composition formula of (Bi 2 O 2 ) 2+ (A m−1 B m O 3m+1 ) 2− or Bi 2 A m−1 B m O 3m+3 , and the excessive content of Bi is in a range of 0<Bi<0.5×m mol in terms of Bi; a c-axis orientation degree of the bismuth layer compound is 80% or higher; and the lower portion electrode is oriented in a [100] direction.