Method and arrangement of a buried capacitor, and a buried capacitor arranged according to said method

摘要

The present invention relates to a method for arrangement of a buried capacitor on a substrate or the like, and a buried capacitor arranged according to the method. In order to diminish the resistive losses in a capacitor and to make it more efficient, in semi-conductor circuits, instead of the polycrystalline layer, one or more bodies of metal such as aluminum or tungsten may be used. This has been made possible using a new technique in which a trench filling of conducting material is etched away without removal through etching of the insulating layer in the trench. After the removal through etching of the trench filling, the trench is filled using the metal as above, whereby the insulating layer between the conducting material and the metal body will separate two conducting surfaces, thereby forming the buried capacitor.