Patent ID: 7078288
Filing Date: 2006-07-18
Classification: H01L

Abstract:
1. A method of producing a ferroelectric capacitor, comprising: preparing a semiconductor substrate having an MOSFET; forming a first interlayer insulating layer on the semiconductor substrate; laminating sequentially a first conductive layer, a ferroelectric layer, and a second conductive layer on the first interlayer insulating layer to form a capacitor forming laminated layer; processing the second conductive layer to form an upper electrode, processing sequentially the ferroelectric layer and the first conductive layer to form a ferroelectric thin layer and an lower electrode, respectively so that a ferroelectric capacitor is formed from the capacitor forming laminated layer, forming a first opening in the ferroelectric thin layer for contacting the lower electrode, performing first restoration annealing relative to a first member formed of the first interlayer insulating layer and the ferroelectric capacitor with the first opening, forming a second interlayer insulating layer on the first interlayer insulating layer for covering the ferroelectric capacitor, forming a second opening in the second interlayer insulating layer through etching, and performing second restoration annealing relative to a second member formed of the first member and the second interlayer insulating layer with the second opening under, in an order of, nitrogen, oxygen, and nitrogen, respectively.