Patent ID: 7094611
Filing Date: 2006-08-22
Classification: H01L

Abstract:
1. A method of producing a ferroelectric capacitor, comprising the steps of: preparing a semiconductor substrate with MOSFETs having impurity diffused areas, said MOSFETs being formed on the semiconductor substrate in a memory cell area and a peripheral circuit area outside the memory cell area, respectively; forming a first interlayer insulating film on the semiconductor substrate; forming a conductive plug in the first interlayer insulating film to be electrically connected to the impurity diffused areas of the MOSFETs; forming a second interlayer insulating film on the first interlayer insulating film; removing a portion of the second interlayer insulating film in the memory cell area to expose a surface of the first interlayer insulating film and a top of the conductive plug while remaining other portion of the second interlayer insulating film in the peripheral circuit area; laminating a first conductive layer, a ferroelectric layer, and a second conductive layer sequentially on the exposed surface of the first interlayer insulating film and an exposed surface of the other portion of the second interlayer insulating film to form a capacitor forming laminated film; forming an etching mask on the capacitor forming laminated film in a capacitor forming area defined on the conductive plug included in the memory cell area; and etching the capacitor forming laminated film with the etching mask to form a ferroelectric capacitor.