Patent ID: 6689656
Filing Date: 2004-02-10
Classification: H01L

Abstract:
A method for fabricating a dynamic random access memory having a trench capacitor, comprising the steps of:forming a trench capacitor on the upper portion of a first semiconductor substrate doped with a first conductive type impurity; forming an insulation layer on the upper portion of the device body having the trench capacitor; attaching a second semiconductor substrate doped with a second conductive type impurity on the upper portion of the insulation layer; exposing a charge storage electrode of the trench capacitor by sequentially patterning the second semiconductor substrate and the insulation layer; forming a strap electrically connected with the charge storage electrode by filling a conductive material to the exposing portion, which is exposed by patterning the second semiconductor substrate and the insulation layer; removing a portion of the second semiconductor substrate and the strap and forming a device separating layer on the removed portion; and forming a transistor on the second semiconductor substrate wherein a drain electrode of the transistor is electrically connected to the strap.