Patent ID: 6153498
Filing Date: 2000-11-28
Classification: H01L

Abstract:
A method of fabricating a buried contact comprising the steps of:providing a substrate having an isolation structure thereon;forming a patterned gate oxide layer and a first patterned conductive layer over the substrate;performing a first N.sup.+ ion implantation to form a first N.sup.+ junction in the substrate;forming a second conductive layer and a silicide layer over the substrate;patterning the silicide layer, the second conductive layer, and the first conductive layer to form a gate and a buried contact, wherein the buried contact is electrically coupled with the first N.sup.+ junction;performing an N.sup.- ion implantation to form a first N.sup.- junction in the substrate using the gate and the buried contact as masks;forming polysilicon spacers on sidewalls of the gate and the buried contact;performing a second N.sup.+ ion implantation to form a second N.sup.+ junction in the substrate using the gate, the buried contact and the polysilicon spacers as masks, wherein the polysilicon spacers are doped; andetching back the polysilicon spacers so that the polysilicon spacer on the sidewall of the gate is removed and a portion of the polysilicon spacer on the sidewall of the buried contact remains.